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Measuring the performance of medical waste recycling systems in China's new first-tier cities with a novel bounded adjusted measure model

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FLEXIBLE SERVICES AND MANUFACTURING JOURNAL 2025年 1-45页

作者： Song, Wenjing ren, jianwei Chen, Chunhua Ma, Chongyu Feng, Chenxi Inner Mongolia Univ Transportat Inst Hohhot 010000 Peoples R China Inner Mongolia Agr Univ Coll Econ & Management Hohhot 010018 Peoples R China

This paper for the first time proposes a two-stage GBAM (GBAMU) model with undesirable inputs and outputs is proposed by combining the generalized bounded adjustment measure (GBAM), the two-stage data envelopment analysis (DEA) method and the DEA considering undesirable inputs and outputs. Furthermore, to mitigate the impact of time-lagged variables on efficiency, a two-stage modified GBAMU model is proposed. The advantages of the two-stage modified GBAMU model are: (1) it allows for the selection of appropriate sample units (SUs) according to the decision-maker's demands;(2) this approach can unveil the specific reasons affecting the efficiency of the decision-making units (DMUs) by opening the 'black box';(3) using this method reduces the impact of time-lagged variables on the accuracy of efficiency. This paper in practice to evaluate the medical waste (MW) recycling in China's new first-tier cities (CNFCs). It offers advice on making the recycling process more efficient and managing MW safely and sustainably. The research findings indicate: (1) the efficiency of MW recycling systems in CNFCs generally shows an increasing trend, but the efficiency had slightly decreased due to the surge in MW caused by the COVID-19 pandemic in 2020. This finding warns policymakers to pay special attention to the stability and resilience of MW recycling systems;(2) Chongqing, Hangzhou, Tianjin, Hefei, and Foshan are efficient cities, while Qingdao, Nanjing, Xian, and Zhengzhou are inefficient. Relevant MW management departments in these inefficient cities need to take centralized measures to achieve more balanced and efficient MW recycling;(3) the efficiency of the medical waste collection and transportation subsystem (MWCS) in CNFCs is lower than that of the medical waste treatment subsystem (MWTS), which is an important factor inhibiting the efficiency of MW recycling systems. This highlights that improving MWCS efficiency is an important breakthrough for optimizing the entire re

关键词： Generalized data envelopment analysis Time-lag Efficiency evaluation Medical waste recycling

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A brief overview of hydrogen production and storage

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SOUTH AFRICAN JOURNAL OF CHEMICAL ENGINEERING 2025年 53卷 60-72页

作者： Sanni, Omotayo Dyosiba, Xoliswa ren, jianwei Univ Pretoria Dept Chem Engn cnr Lynnwood Rd & Roper St ZA-0028 Pretoria South Africa

Given that the demand for hydrogen is predicted to grow by around eight times by 2050 compared to 2020, a number of factors may make it difficult to implement hydrogen applications successfully. Although storing hydrogen is still a major problem, it is seen to be one of the most promising alternative fuels replacing current fossil fuels. Technologies for hydrogen generation have emerged as a key component of the energy mix in a society that seeks to replace fossil fuels in order to reduce greenhouse gas emissions and address other environmental issues. Hydrogen is a clean "green" fuel of interest that can help achieve aggressive goals for reducing greenhouse gas emissions between 2035 and 2050. Currently used in industrial application, hydrogen compression and liquefaction are energy-intensive processes because they require low temperature (253 degrees C) and high pressure (30-70 MPa). Since chemical hydrogen storage allows for the safe storage of hydrogen-rich molecules in ambient settings, it is a possible substitute. Even though there are several molecules that are thought to be hydrogen transporters, some of them lackviable prospects for widespread commercialization. The present status of development of important areas of hydrogen production and storage technologies is reviewed, along with the advantages and disadvantages of each technique in relation to cost, efficiency, safety, and storage capacity. The safety implications of different H2 storage methods have received particular attention because safety issues are one of the main obstacles to the widespread use of H2 as a fuel source. This study also identifies the main obstacles and possibilities that the commercialization and development of hydrogen storage technology must overcome, such as the requirement for better materials, better system integration, and greater acceptability and awareness. From the reviewed literature, we have learned that when the challenges and constraints that are involved with the s

关键词： Global warming Sustainable aspects Hydrogen economy Hydrogen production Hydrogen storage Chemical storage Green energy

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Talking-head video generation with long short-term contextual semantics

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APPLIED INTELLIGENCE 2025年第2期55卷 1-17页

作者： Jing, Zhao Bie, Hongxia Wang, Jiali Bie, Zhisong Li, Jinxin ren, jianwei Zhi, Yichen Beijing Univ Posts & Telecommun Sch Artificial Intelligence Beijing 100876 Peoples R China

One-shot talking-head video generation involves a face-appearance source image and a series of motions extracted from driving frames to produce a coherent video. Most existing methods merely use the source image to generate videos over long time intervals, which leads to detail loss and distorted images due to the semantics mismatch. Short-term semantics extracted from previous generated frames with temporal consistency can complement the mismatches of long-term semantics. In this paper, we propose a talking-head generation method utilizing long short-term contextual semantics. First, the cross-entropy of real frame and generated frame with long short-term Semantics is mathematically modeled. Then, a novel semi-autoregressive GAN is proposed to efficiently avoid semantics mismatch by utilizing complementary long-term and autoregressively extracted short-term semantics. Moreover, a short-term semantics enhancement module is proposed aiming for suppressing the noise in the autoregressive pipeline and reinforcing fusion of the long short-term semantics. Extensive experiments have been performed and the experimental results demonstrate that our method can generate detailed and refined frames and outperforms the other methods, particularly with large motion changes.

关键词： Talking-head video generation Long short-term semantics Semi-autoregressive Generative adversarial network (GAN)

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Using high-strength composite fabric to improve the mechanical response of metallic foam materials

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MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 2025年

作者： ren, jianwei Li, Xue Zhao, Zhenyu Zhang, Daqiao Wu, Jian Li, Bangjie Xian Res Inst High Technol Xian 710025 Peoples R China Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Nanjing 210016 Peoples R China Luoyang Ship Mat Res Inst Luoyang Peoples R China Nanjing Univ Aeronaut & Astronaut MIIT Key Lab Multifunct Lightweight Mat & Struct Nanjing Peoples R China

Metal foam is a typical ultralight and multifunctional material whose porous construction leads to an extremely weak load-bearing capacity. Inspired by foam construction in nature, we propose encasing high-strength fabric around the outside of bare metal foams to enhance their mechanical properties. Three-point bending tests were implemented to verify this insightful concept and to explore the load-bearing capacity improvement induced by the presence of high-strength composite encasement. Three influencing factors, including geometric size, configuration nature of the composite fabric, and continuity of the composite encasement, were considered and discussed experimentally. The comparison between metal foams with and without composite encasement shows that encasement made of high-strength fabric significantly improves the load-bearing capacity of the foam material, especially the bending resistance. In addition, the proposed retrofitted metal foam offers a promising lightweight advantage over its competing designs. This study provides technical guidance for the structural application of these ultralight materials.

关键词： High-strength composite fabric hybrid foam material encasing effect enhanced load-bearing capacity three-point bending test

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Autoencoder artificial neural network for accelerated forward and inverse design of locally resonant acoustic metamaterials

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JOURNAL OF APPLIED PHYSICS 2025年第5期137卷

作者： Jiang, Yongfeng Li, Zheng ren, jianwei Feng, Xiangchao Gao, Jinling Shen, Cheng Meng, Han Lu, Tianjian Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Aerosp Struct Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut MIIT Key Lab Multifunct Lightweight Mat & Struct Nanjing 210016 Peoples R China PLA Rocket Force Univ Engn Coll Combat Support Xian 710025 Peoples R China China Acad Aerosp Sci & Technol Innovat Adv Mat & Energy Ctr Beijing 100088 Peoples R China

The noise issues brought about by the development of the aviation and other industries have put forward an urgent demand for the design of low-frequency noise reduction structures. An autoencoder artificial neural network (ANN) is established in this paper to achieve accelerated low-cost forward and on demand design of locally resonant metamaterials simultaneously. Inspired by the framework of the autoencoder network, the proposed ANN is composed of an in series connected inverse prediction neural network and a forward prediction neural network module to avoid program errors by multisolution problems. A theoretical model is first set up in the paper to calculate the sound transmission loss (STL) of a locally resonant metamaterial plate and then validated by finite element simulation. The autoencoder ANN is subsequently trained using the dataset constructed based on the theoretical model. The accuracy of the well-trained ANN is then evaluated by making a comparison with the theoretical calculation and originally expected STL curves. The advantages of the proposed ANN over the theoretical model and numerical simulation are analyzed, and the results indicate that the proposed autoencoder ANN takes 2 and 6 orders of magnitude less time to complete the forward design than theoretical and numerical methods. The proposed ANN also demonstrates its ability in inverse design, which is hardly achieved using theoretical and numerical methods. The proposed ANN provides a new design method for accelerated forward and inverse design of noise reduction structures.

关键词： Noise abatement

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Shortening the Reaction Pathway of Sulfur Redox Kinetics with 2,5-Dichloro-1,4-Benzoquinone to Minimize the Shuttle Effect in Lithium-Sulfur Batteries

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ACS APPLIED MATERIALS & INTERFACES 2025年第15期17卷 22780-22791页

作者： Shao, Jiayi Wang, Hanxiao Huang, Xinjie Ma, Xianguo Wang, Xuyun Huang, Hongsheng ren, jianwei Wang, Rongfang Qingdao Univ Sci & Technol Coll Chem Engn Qingdao 266042 Peoples R China Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Shandong Energy Inst Qingdao New Energy Shandong Lab Qingdao 266101 Peoples R China Guizhou Inst Technol Sch Chem Engn Guiyang 550003 Peoples R China Univ Pretoria Dept Chem Engn ZA-0028 Hatfield South Africa

The low active material utilization, sluggish sulfur redox kinetics, and formation of unstable interfacial layers remain critical challenges in lithium-sulfur (Li-S) batteries. To minimize these effects, 2, 5-dichloro-1,4-benzoquinone (DCBQ) was demonstrated in this study as an electrolyte additive. Leveraging its unique symmetrical structure, DCBQ interacted with polysulfides during charge and discharge cycles to form insoluble symmetric cyclic organic polysulfide intermediates. These intermediates served as a cathode-electrolyte interphase (CEI) by attaching to the sulfur cathode surface, which mitigated the shuttle effect by reducing the accumulation of insoluble Li2S and suppressing polysulfide dissolution. In the presence of DCBQ, the discharge pathway for Li2S6 transitioned from Li2S6 -> Li2S4 -> Li2S2 -> Li2S to a shortened sequence of Li2S6 -> Li2S3 -> Li2S, enhancing sulfur utilization and streamlining redox processes. On the anode side, the formation of LiCl and intermediate compounds contributed to an organic-inorganic solid-electrolyte interface (SEI), which protected the lithium anode, improved the Li+ diffusion coefficient (6.63 x 10-11 cm2 S- 1), and eventually enhanced the battery's cycling stability. Consequently, the Li-S battery that included the DCBQ additive exhibited nearly 100% Coulombic efficiency at a rate of 0.2 C. It showed an initial discharge-specific capacity of 992.24 mAh g-1 and experienced a low-capacity degradation of just 0.45% per cycle over 120 cycles. These results highlight the effectiveness of DCBQ as an electrolyte additive in enhancing both the performance and stability of the battery.

关键词： insoluble symmetric cyclic organic polysulfide intermediates shortened redox pathway cathode-electrolyte interphase(CEI) shuttle effect lithium-sulfur batteries

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Crystallinity engineering of FexO through doping and ligand design for improved oxygen Catalysis in Zinc-Air batteries

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CHEMICAL ENGINEERING JOURNAL 2025年 511卷

作者： Peng, Jiao Liu, Fangfang Huang, Xinjie Feng, Lijuan Wang, Hui Wang, Xuyun ren, jianwei Wang, Rongfang Qingdao Univ Sci & Technol Coll Chem Engn Qingdao 266042 Peoples R China Weifang Univ Sci & Technol Shandong Peninsula Blue Econ & Engn Res Inst Shandong Engn Lab Clean Utilizat Chem Resources Weifang 262700 Peoples R China Univ Pretoria Dept Chem Engn Cnr Lynnwood Rd & Roper St ZA-0028 Hatfield South Africa

The crystallinity of metal oxides plays a pivotal role in regulating the arrangement of metal atoms and thereby influencing electrocatalytic performance. This study focuses on carbon-supported transition metal oxide catalysts (V-FexO/NC) and investigates how improved crystallinity impacts their performance in both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). It is demonstrated that doping with vanadium (V) and introducing nitrogen-containing ligands enhance the crystallinity of FexO nanoparticles in the V-FexO/NC catalyst. The high crystallinity of FexO facilitates efficient electron transfer within the material and sequentially resulting in superior electrical conductivity. Furthermore, electron paramagnetic resonance (EPR) analysis suggests a lower concentration of oxygen vacancies in V-FexO/NC sample, attributed to the well-ordered crystalline structure of FexO, which minimizes internal defects and improves catalyst stability. As a result, the VFexO/NC composite demonstrates exceptional electrocatalytic efficiency, evidenced by a potential gap of merely 0.64 V, which surpasses the performance of the Pt/C + RuO2 catalyst (0.66 V), while also exhibiting outstanding durability in both ORR and OER processes. Zinc-air batteries incorporated with V-FexO/NC exhibit a stable opencircuit voltage (1.46 V) and high specific capacity (743.0 mAh g(-1)).

关键词： High crystallinity FexO nanoparticles Oxygen electrocatalyst Zinc-air batteries

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Failure response of bolt-clamped sandwich containing a hybrid foam core with continuous composite encasement

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COMPOSITE STRUCTURES 2025年 356卷

作者： ren, jianwei Meng, Han Gao, Wenbo Li, Xue Zhang, Daqiao Zhu, Hongwei Wu, Jian Li, Bangjie Zhao, Zhenyu Xian Res Inst High Technol Xian 710025 Peoples R China Nanjing Univ Aeronaut & Astronaut MIIT Key Lab Multifunct Lightweight Mat & Struct Nanjing 210016 Peoples R China Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Aerosp Struct Nanjing 210016 Peoples R China Beijing Inst Specialized Machinery Beijing 100143 Peoples R China Luoyang Ship Mat Res Inst Luoyang 471000 Peoples R China

Investigating the failure behaviors and load-bearing performance of bolt-clamped target loaded is crucial for the design of the connection between purposely designed parts to others. The failure response and underlying mechanism within the bolt-clamped sandwich with a continuous composite encasement (CCE) are investigated both experimentally, numerically, and analytically. An analytical model is developed through the competition mechanism between the four potential failure modes, which is also employed to construct a failure mechanism map. The load-bearing capacity and operative failure initiation are determined as a function of geometric dimensions, which include the diameter size and the position of the bolt hole. A combination of analytical calculation and finite element simulation shows that the presence of a CCE component significantly improves the load-bearing capacity of such a sandwich target by at least 59%. And such enhancement effect is governed directly by the combination of the bolt-hole dimensions and the material properties of CCE. Furthermore, the optimal design targeting the superior load-bearing force of bolt-clamped sandwich is presented via the representation of developed failure mechanism maps. In addition, the mechanism map explains the underlying mechanism of the complex failure mode observed in postmortem sandwiches from the perspective of the cumulative damage history of complex failure behavior scenarios. Finally, FE simulation for the large-scale sandwich is implemented to compare the enhancement effect induced by CCE on the dimensional scale of such bolt-clamped sandwiches. The results of this study are valuable for understanding the failure response and load-bearing behavior of bolt-clamped sandwiches and provide technical guidance for the optimal design of the clamping strategy with the desired mechanical properties.

关键词： Sandwich construction Bolt-clamped boundary Failure behavior Load-bearing capacity Continuous composite encasement

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Enhancing Polysulfide Conversion in Lithium-Sulfur Batteries through the Synergistic Effect of 2,6-Dihydroxyanthraquinone and Co Atoms

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ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2025年第5期13卷 2154-2163页

作者： You, Huijuan Liu, Fangfang Wang, Hanxiao Wang, Zining Wang, Xuyun Zhang, Boshen Tang, Kuanshuo ren, jianwei Wang, Rongfang Qingdao Univ Sci & Technol Coll Chem Engn Qingdao 266042 Peoples R China Weifang Univ Sci & Technol Shandong Peninsula Blue Econ & Engn Res Inst Shandong Engn Lab Clean Utilizat Chem Resources Weifang 262700 Peoples R China Chinese Acad Sci Qingdao Inst Bioenergy & Bioproc Technol Shandong Energy Inst Qingdao New Energy Shandong Lab Qingdao 266101 Peoples R China Tongji Univ Sch Chem Sci & Engn Shanghai 200092 Peoples R China Univ Pretoria Dept Chem Engn ZA-0028 Hatfield South Africa

Currently, lithium-sulfur batteries for wider applications are challenged by both the shuttle effect in the cathodes as well as the slow kinetics of the sulfur redox reactions. Although metal compounds have been reported to suppress the shuttle effect of lithium polysulfides (LiPSs) by chemically adsorbing LiPSs and catalyzing their conversion, current methods for sulfur fixation on cathode materials remain insufficient. In this work, 2,6-dihydroxyanthraquinone (DHAQ) is tightly adsorbed on a Co-doped porous carbon (Co-C) substrate through pi-pi stacking. The abundant oxygen-containing functional groups in DHAQ form Li-O bonds with lithium in the LiPSs and enable in situ covalent fixation. Meanwhile, cobalt in Co-C forms Co-S bonds with sulfur in LiPSs, providing an efficient pathway for electron transfer and promoting LiPS conversion. Thus, the DHAQ/Co-C composite provides dual chemical adsorption capabilities that mitigate the "shuttle effect" of LiPSs. Additionally, the conductive merits of the DHAQ and Co-C networks accelerate electron transfer, enhance LiPS redox kinetics, and increase the battery's specific capacity. In the end, the optimized S@DHAQ/Co-C composite demonstrates an initial discharge capacity (1385 mAh g-1) at 0.1C. After 600 cycles, the electrode displays a capacity decay rate of 0.062% at 1C. Compared with metal-based materials that rely solely on chemical sulfur fixation, the synergistic effect of organic oxygen atoms and metals in sulfur fixation offers significant improvements.

关键词： synergistic effect redox reaction kinetics molecular orbital energy levels lithium-sulfur batteries electron transfer

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Organic ligands and CeO2-induced generic valence modulation strategies to design Fe active sites for promoted oxygen involved reactions in rechargeable zinc-air batteries

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JOURNAL OF MATERIALS CHEMISTRY A 2025年第9期13卷 6719-6728页

作者： Peng, Jiao Wang, Zining ren, jianwei He, Yudong Li, Jiahao Xin, Shichang Wang, Xuyun Wang, Hui Wang, Rongfang Qingdao Univ Sci & Technol Coll Chem Engn State Key Lab Base Eco Chem Engn Qingdao 266042 Peoples R China Tongji Univ Sch Chem Sci & Engn Shanghai 200092 Peoples R China Univ Pretoria Dept Chem Engn Cnr Lynnwood Rd & Roper St ZA-0028 Hatfield South Africa

The limited catalytic selectivity and stability of most metal oxides during reactions are primarily due to their irreversible valence transitions. To address this challenge, this study focuses on the development of CeO2-induced valence-tunable FexO nanoparticles, which were supported on a nitrogen-doped carbon substrate to enhance the catalytic performance of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). In situ Raman spectroscopy confirmed that the key intermediates involved in the ORR on the CeO2-FexO/NC catalyst surface are *O2- and *OOH, which remain stable even at low potentials. Ultraviolet photoelectron spectroscopy (UPS) revealed that the CeO2-FexO/NC catalyst exhibits a lower work function, which facilitates electron escape and promotes the activation of oxygen molecules. X-ray photoelectron spectroscopy (XPS) further showed that Fe in CeO2-FexO/NC has a reduced binding energy, with FexO acting as a broad valence electron reservoir (0-3 e-), which enhances proton-coupled electron transfer and accelerates reaction kinetics during the catalytic process. As a result, the CeO2-FexO/NC sample demonstrates outstanding bifunctional oxygen electrocatalytic performance, with a potential gap of just 0.62 V, surpassing that of the Pt/C + RuO2 catalyst (0.65 V). Moreover, zinc-air batteries utilizing the CeO2-FexO/NC catalyst exhibit a high specific capacity of 743.0 mA h g-1.

关键词： X ray photoelectron spectroscopy

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