摘要：
Biomass gasification technology, as an efficient renewable energy solution, has garnered widespread attention. This study uses experimental data and exergy analysis to comprehensively investigate the impact of key process parameters such as temperature, Equivalence Ratio (ER), Steam to Carbon ratio (S/C), bed pressure, agents, catalysts, and raw material characteristics on the efficiency of biomass fluidized bed gasification. The findings suggest that higher temperatures significantly enhance the exergy and production rates of gas by improving thermodynamic and kinetic conditions. An optimal ER is identified, which balances heat release and minimizes syngas dilution, with benefits diminishing beyond this optimal range. Variations in the S/C ratio initially increase but subsequently reduce both the gas production rate and exergy efficiency. The introduction of pure oxygen notably enhances the system's efficiency. Additionally, the results indicate that optimal bed pressure is essential for fostering effective gas-solid interactions, and even a small amount of catalyst can substantially improve exergy efficiency. Additionally, increasing elemental analysis carbon rather than fixed carbon has been proven to be more beneficial for gasification, while controlling moisture content and particle size is also important for optimizing gasification performance. This study provides a pathway for the development of more efficient and effective biomass gasification systems by focusing on optimizing these critical parameters.
Biomass gasification technology, as an efficient renewable energy solution, has garnered widespread attention. This study uses experimental data and exergy analysis to comprehensively investigate the impact of key process parameters such as temperature, Equivalence Ratio (ER), Steam to Carbon ratio (S/C), bed pressure, agents, catalysts, and raw material characteristics on the efficiency of biomass fluidized bed gasification. The findings suggest that higher temperatures significantly enhance the exergy and production rates of gas by improving thermodynamic and kinetic conditions. An optimal ER is identified, which balances heat release and minimizes syngas dilution, with benefits diminishing beyond this optimal range. Variations in the S/C ratio initially increase but subsequently reduce both the gas production rate and exergy efficiency. The introduction of pure oxygen notably enhances the system's efficiency. Additionally, the results indicate that optimal bed pressure is essential for fostering effective gas-solid interactions, and even a small amount of catalyst can substantially improve exergy efficiency. Additionally, increasing elemental analysis carbon rather than fixed carbon has been proven to be more beneficial for gasification, while controlling moisture content and particle size is also important for optimizing gasification performance. This study provides a pathway for the development of more efficient and effective biomass gasification systems by focusing on optimizing these critical parameters.
作者：
Liu, S.;Xiang, X. N.;Chen, W. N.;Li, T.;Guo, J.;...
期刊：
Applied Ecology and Environmental Research,2025年 ISSN：1589-1623
通讯作者：
Xiang, XN
作者机构：
[Xiang, X. N.; Wang, X. X.; He, C. H.; Li, T.; Liu, J. X.; Chen, W. N.; Xiang, Y. J.; Guo, J.; Liu, S.] Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Xiang, XN ] H;Hunan City Univ, Sch Municipal & Geomat Engn, Yiyang 413000, Peoples R China.
关键词：
AEE;AGSD;coupling coordination degree;DEA-SBM-ML;agricultural agglomeration areas
摘要：
This study explores the coupling relationship between AEE (Agricultural Energy Efficiency) 2011 to 2021. A carbon emission model and the super-efficiency DEA-SBM-ML (Date Envelopment Analysis - Slacks Based Measure - Malumquist-Luenberger) method are used to measure AEE, while an AGSD system is built with hybrid weighting. A coupling coordination model was used to analyze the AEEAGSD coordination. The research conclusions are as follows: (1) AEE in China's agricultural agglomeration areas shows a stable improvement; however, Gansu and Yunnan lagged. (2) The comprehensive AGSD scores exhibit a significant upward trend, although provinces like Xinjiang and Heilongjiang remain at relatively low levels. (3) Both the AEE and AGSD coupling coordination scores show an average increase of 8.11%. The coupling coordination score in the southern areas exceeds that of the northern areas by 4.98%. There is a substantial variation in the coupling coordination degrees, with most provinces achieving a good level; while Gansu stayed at barely level, urging agricultural model optimization. This study expands cross-disciplinary research on energy and ecosystems, providing theoretical support for coordinated agricultural modernization and green sustainability in China, as well as empirical insights for other regions worldwide.
摘要：
At present, dynamic data stream classification has achieved many successful results through concept drift detection and ensemble learning. However, generally, due to delay in concept drift detection, the active classifier may further learn data belonging to a new concept. This will ultimately degrade the generalization capability of this active classifier on its corresponding concept. Thus, how can a classifier corresponding to one concept unlearns the learned data belonging to another concept? Two unlearning algorithms are proposed to address this problem. The first one based on the passive-aggressive (PA) algorithm adopts the least squares method to reversely update the already-trained model, achieving the effect of approximately unlearning, while another based on a modified PA algorithm achieves complete unlearning by modifying the loss function of the PA algorithm. The comprehensive experiments illustrated the effectiveness of these proposed methods.
摘要：
The progress of electronic technology has driven the miniaturization and integration of devices, thereby heightening interest in micro-battery research. However, the conventional methods for fabricating micro-batteries (MBs) are characterized by complexity and high cost, presenting significant challenges to their further development. In this study, we propose a novel approach for fabricating zinc-ion micro-batteries (ZIMBs) by integrating printed current collectors with electrodeposition technology. Conductive ink, formulated from a blend of various carbon materials, was employed for screen-printing the current collectors, while MnO₂ and Zn were directly electrodeposited onto their surfaces as active materials. This approach enables the fabrication of electrodes in custom shapes, eliminating the need for pre-cutting or photolithography steps, thus reducing process complexity and optimizes costs. The full battery assembled with MnO 2 deposited on the carbon-based ink film and zinc foil exhibit remarkable rate performance, high specific capacity (417 mAh/g), and good cycling stability (81.17 % capacity retention after 1000 cycles). More importantly, the fabricated micro-battery experiences less than 5 % capacity loss after repeated bending and can reliably operate for over 200 cycles, demonstrating its potential for integration with various flexible electronic devices. This work presents a novel solution for manufacturing flexible Zn//MnO 2 batteries for future electronic applications.
The progress of electronic technology has driven the miniaturization and integration of devices, thereby heightening interest in micro-battery research. However, the conventional methods for fabricating micro-batteries (MBs) are characterized by complexity and high cost, presenting significant challenges to their further development. In this study, we propose a novel approach for fabricating zinc-ion micro-batteries (ZIMBs) by integrating printed current collectors with electrodeposition technology. Conductive ink, formulated from a blend of various carbon materials, was employed for screen-printing the current collectors, while MnO₂ and Zn were directly electrodeposited onto their surfaces as active materials. This approach enables the fabrication of electrodes in custom shapes, eliminating the need for pre-cutting or photolithography steps, thus reducing process complexity and optimizes costs. The full battery assembled with MnO 2 deposited on the carbon-based ink film and zinc foil exhibit remarkable rate performance, high specific capacity (417 mAh/g), and good cycling stability (81.17 % capacity retention after 1000 cycles). More importantly, the fabricated micro-battery experiences less than 5 % capacity loss after repeated bending and can reliably operate for over 200 cycles, demonstrating its potential for integration with various flexible electronic devices. This work presents a novel solution for manufacturing flexible Zn//MnO 2 batteries for future electronic applications.
摘要：
This study develops a novel hyperbolic coupled moisture-heat model by extending the non-Fourier law and non-Fick law to solve a transient response of hygrothermoelastic field induced by internal heat and moisture sources in a circular disk. In contrast to classical diffusion theory, this model captures the finite propagation velocity of heat and moisture waves through relaxation time parameters. By utilizing Laplace transform and finite Hankel transform techniques, a semi-analytical method is formulated to determine temperature, humidity, displacement, and stress fields of a disk made of T300/5208 graphite epoxy composite. The model analyzes the transient responses of the hygrothermomechanical field caused by internal thermal/moisture shocks under given temperature and moisture at its boundary and studies systematically the coupling and decoupling mechanisms among temperature, humidity, and stress fields. The findings notably enhance the accuracy of predicting composite material performance under various environmental conditions, thereby furnishing a robust scientific basis for the design and optimization of disks in multi-field environment. The proposed semi-analytical method offers invaluable insights into the intricate hygrothermoelastic behavior of composite structures.
期刊：
Measurement Science And Technology,2025年36(4):046133 ISSN：0957-0233
通讯作者：
Zhang, S
作者机构：
[Zhang, Sheng] Hunan City Univ, Sch Management, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Liang; Huang, Ning; Zhang, Sheng; Deng, Zongwei] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Liang; Zhang, Sheng; Deng, Zongwei] Hunan City Univ, Higher Educ Inst Hunan Prov, Key Lab Green Bldg & Intelligent Construct, Yiyang 413000, Hunan, Peoples R China.;[Chen, Qianqian] Hunan Commun Polytech, Inst Civil Engn, Changsha 410000, Hunan, Peoples R China.
通讯机构：
[Zhang, S ] H;Hunan City Univ, Sch Management, Yiyang 413000, Hunan, Peoples R China.;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Hunan, Peoples R China.;Hunan City Univ, Higher Educ Inst Hunan Prov, Key Lab Green Bldg & Intelligent Construct, Yiyang 413000, Hunan, Peoples R China.
关键词：
rock classification;wavelet scattering transform;support vector machine;sensitivity analysis;deep learning
摘要：
In geological exploration and tunnel/underground engineering, precise, rapid, and intelligent rock lithology identification is crucial. A wavelet scattering transform-support vector machine (WST-SVM) rock image classification method is proposed that combines WST with SVM to address the limitations of conventional convolutional neural networks reliant on annotated samples. The method extracts multi-scale features from rock images using WST and trains an SVM classifier, achieving superior performance in test accuracy, macro-average precision, recall, and F1-score on a dataset of six rock types. Parameter analysis reveals that increasing invariant scale, decomposition transformations, and quality factor enhances feature matrix dimensionality and computational time. This approach reduces the need for extensive annotated samples and provides a practical solution for improving the accuracy and efficiency of rock lithology identification in geological exploration and tunnel engineering.
期刊：
EUROPEAN JOURNAL OF APPLIED MATHEMATICS,2025年:1-15 ISSN：0956-7925
通讯作者：
Liu, YF
作者机构：
[Ding, Qian; Yu, Jianshe; Liu, Yunfeng] Guangzhou Univ, Ctr Appl Math, Guangzhou, Guangdong, Peoples R China.;[Ding, Qian] Hunan City Univ, Coll Sci, Yiyang, Peoples R China.;[Guo, Zhiming; Liu, Yunfeng] Guangzhou Univ, Sch Math & Informat Sci, Guangzhou, Guangdong, Peoples R China.;[Chen, Yuming] Wilfrid Laurier Univ, Dept Math, Waterloo, ON, Canada.
通讯机构：
[Liu, YF ] G;Guangzhou Univ, Ctr Appl Math, Guangzhou, Guangdong, Peoples R China.;Guangzhou Univ, Sch Math & Informat Sci, Guangzhou, Guangdong, Peoples R China.
关键词：
seasonal change;cyclical human activity;switching dynamical system;periodic solution
摘要：
Seasonal changes and cyclical human activities (such as periodic fishing bans, Wolbachia -based mosquito population control, and school term breaks) have significant impacts on population dynamics. We propose a general switching dynamical model to describe these periodic changes. The existence, uniqueness and stability of positive periodic solutions are thoroughly investigated. The results are stated in terms of an introduced threshold value. To demonstrate their practicability, the obtained results are applied to two biological situations.
摘要：
Pb contamination is a serious environmental concern, posing significant threats to ecosystems and human health. Biochar-based functional materials have attracted considerable attention owing to their great potential for practical application. In this study, a novel N-functionalized tourmaline-biochar composite (TNBC) from pomelo peels with co-modifications using urea and tourmaline was developed. The immobilization of Pb in solution and soil by TNBC was investigated, and influencing factors and mechanisms were also analyzed. The experimental maximum adsorption capacity of Pb 2+ on TNBC was 600.60 mg/g. Analysis of morphologies and surface functional groups revealed that precipitation regulated Pb 2+ adsorption on TNBC, followed by cation exchange, complexation, and metal-π interaction. The effect of co-existing cations in the solution on adsorption was marginal. Correlation analysis disclosed that enriched plenty of minerals and N-functional groups on TNBC surface were the main reasons for improving Pb 2+ adsorption on TNBC compared with pristine biochar. Moreover, TNBC exhibited potential for soil remediation and could be an alternative amendment for Pb contamination. The TNBC increased the pH, electroconductivity, and residual Pb content of the polluted soil; therefore, it can ameliorate the effects of Pb contamination in the soil. This study provides an alternative viewpoint on developing functionalized biochar composites for soil remediation.
Pb contamination is a serious environmental concern, posing significant threats to ecosystems and human health. Biochar-based functional materials have attracted considerable attention owing to their great potential for practical application. In this study, a novel N-functionalized tourmaline-biochar composite (TNBC) from pomelo peels with co-modifications using urea and tourmaline was developed. The immobilization of Pb in solution and soil by TNBC was investigated, and influencing factors and mechanisms were also analyzed. The experimental maximum adsorption capacity of Pb 2+ on TNBC was 600.60 mg/g. Analysis of morphologies and surface functional groups revealed that precipitation regulated Pb 2+ adsorption on TNBC, followed by cation exchange, complexation, and metal-π interaction. The effect of co-existing cations in the solution on adsorption was marginal. Correlation analysis disclosed that enriched plenty of minerals and N-functional groups on TNBC surface were the main reasons for improving Pb 2+ adsorption on TNBC compared with pristine biochar. Moreover, TNBC exhibited potential for soil remediation and could be an alternative amendment for Pb contamination. The TNBC increased the pH, electroconductivity, and residual Pb content of the polluted soil; therefore, it can ameliorate the effects of Pb contamination in the soil. This study provides an alternative viewpoint on developing functionalized biochar composites for soil remediation.
摘要：
In this paper, a degenerated reaction-diffusive avian influenza model with logistic source and spatial heterogeneity is proposed. We analyze the global compact attractor of the solution semi-flow of the model using the $ k $-contraction method. Furthermore, the threshold dynamics in terms of the basic reproduction number $ \mathcal{R}_0^{h} $ are investigated. Specifically, if $ \mathcal{R}_0^{h} < 1 $, the infection-free steady state of the system is globally asymptotically stable. If $ \mathcal{R}_0^{h} >1 $, then the endemic equilibrium is uniformly persistent. Finally, numerical simulations are performed to demonstrate the theoretical results.
摘要：
Weld residual stress (WRS) is a major contributor to fatigue cracking at the U-rib-to-deck (RD) joints of orthotropic steel bridge decks (OSBD). To investigate the generation, and distribution mechanism of WRS and its impact on the ultimate bearing capacity, an FEA model of the RD joint was developed by using a thermo-mechanical coupling calculation approach. Then, the differences in WRS of RD joints with different weld forms were compared. Furthermore, a simulation method considering WRS for the ultimate bearing capacity of OSBD and a theoretical formula for its calculation were developed. Finally, the impact of different weld types on the RD joint's ultimate bearing capacity was compared. The results revealed that the maximum WRS values at the weld center were 410 MPa, which highlights the need for particular attention to fatigue failure at this location. For the application of different weld forms in RD joints, it is recommended to prioritize concave welds for structures with high fatigue requirements, while convex welds are more suitable for non-critical areas with low fatigue requirements, and select right-angle welds in regions of moderate fatigue requirements. The ultimate bearing capacity considering WRS showed a 5 % improvement in accuracy compared to that without WRS. The ultimate bearing capacity of the RD joint can be calculated by using the theoretical formula proposed in this article. Additionally, the weld type has a negligible consequence on the ultimate bearing capacity of OSBD.
Weld residual stress (WRS) is a major contributor to fatigue cracking at the U-rib-to-deck (RD) joints of orthotropic steel bridge decks (OSBD). To investigate the generation, and distribution mechanism of WRS and its impact on the ultimate bearing capacity, an FEA model of the RD joint was developed by using a thermo-mechanical coupling calculation approach. Then, the differences in WRS of RD joints with different weld forms were compared. Furthermore, a simulation method considering WRS for the ultimate bearing capacity of OSBD and a theoretical formula for its calculation were developed. Finally, the impact of different weld types on the RD joint's ultimate bearing capacity was compared. The results revealed that the maximum WRS values at the weld center were 410 MPa, which highlights the need for particular attention to fatigue failure at this location. For the application of different weld forms in RD joints, it is recommended to prioritize concave welds for structures with high fatigue requirements, while convex welds are more suitable for non-critical areas with low fatigue requirements, and select right-angle welds in regions of moderate fatigue requirements. The ultimate bearing capacity considering WRS showed a 5 % improvement in accuracy compared to that without WRS. The ultimate bearing capacity of the RD joint can be calculated by using the theoretical formula proposed in this article. Additionally, the weld type has a negligible consequence on the ultimate bearing capacity of OSBD.
摘要：
This paper explores the propagation characteristics of Airyprime beams in an inhomogeneous medium with periodic potential, from both theoretical and numerical simulation perspectives. By using the method of separation of variables, the Gross-Pitaevskii equation with periodic potential was solved to obtain the breather soliton solution and breathing period. Additionally, considering the medium and beam parameters, numerical simulations were performed to study the propagation characteristics of Airyprime beams and the superposition between two Airyprime beams. First, the influence of initial medium parameters (modulation intensity P and modulation frequency omega) on the propagation characteristics was studied. Then, the effect of initial beam parameters (initial chirp C and position x0) on the propagation characteristics was analyzed. Finally, the superposition between two Airyprime beams with different phases phi=0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi = 0$$\end{document}phi\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi$$\end{document}, amplitudes A, and initial separations x0 was investigated. By changing the initial medium parameters, the breathing period and central position of the breather soliton can be controlled; by adjusting the initial beam parameters, the deflection direction, size, and maximum intensity of the breather soliton can be manipulated. Changing the phase phi=0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi = 0$$\end{document}phi\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\varphi$$\end{document}, amplitude A, and initial separation x0 of the two Airyprime beams can form different bound-state breather solitons. The results provide a theoretical foundation for the propagation and control of Airyprime beams, as well as for their potential applications in optical communication.
摘要：
Gas adsorption characteristics of coal seams are primarily controlled by the pore structure of coal. To clarify the pore structure and adsorption characteristics of soft and hard coal, this paper experimentally studied Jiulishan anthracite, Shanxi Xinyuan lean coal, and Panbei gas-fat coal. Combined with FHH, Langmuir, and Polanyi theories, pore structures and adsorption properties of soft/hard coals with varying metamorphism were analyzed. Results show that hard coal exhibited more developed macropores but fewer micro/mesopores than soft coal. Higher metamorphism increased maximum mercury intrusion volume and total pore volume. Hard coal mercury curves with varying metamorphism show negligible/small hysteresis loops and semi-closed pores. Soft coal exhibits hysteresis loops dominated by semi-closed and “ink-bottle” pores. Pore fractal dimensions exhibit a two-stage pattern, with each stage fractal dimension increasing with metamorphism and damage. As coal rank increases, adsorption constant a rises from 25.84 to 37.59 cm 3 /g, while b fluctuates between 0.76 and 1.54 MPa −1 . Soft coals of the same rank show higher saturated adsorption capacities than hard coals. All adsorption curves display polynomial behavior, with adsorption potential energy increasing with metamorphism and soft coal having greater surface adsorption potential energy than hard coal.
作者：
Zhang, Liang;Jiang, Hao;Zhang, Sheng;Bei, Zhenghao;Huang, Ning
期刊：
Measurement,2025年253:117561 ISSN：0263-2241
通讯作者：
Jiang, H
作者机构：
[Zhang, Liang; Huang, Ning; Zhang, Sheng] Hunan City Univ, Coll Civil Engn, 518 Yingbin East Rd, Yiyang 413000, Hunan, Peoples R China.;[Bei, Zhenghao; Jiang, Hao] Changsha Univ Sci & Technol, Sch Civil Engn, 960 Wanjiali South RD, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Jiang, H ] C;Changsha Univ Sci & Technol, Sch Civil Engn, 960 Wanjiali South RD, Changsha 410114, Hunan, Peoples R China.
关键词：
Tunnel lining detection;Cavity filler;Forward simulation;Generalized S -transform;Wavelet packet analysis
摘要：
Tunnel lining cavities and other defects can cause cracks in tunnel structures and damage to concrete, seriously affecting the safety of driving in tunnels. Due to varying geological conditions, the materials filling different cavity areas in tunnels differ. By formulating corresponding repair measures for different fillers in cavity areas, many unnecessary losses can be avoided. Therefore, this paper proposes a method based on multi-parameter information for identifying and extracting the characteristics of different fillers in tunnel cavity areas through forward simulation using gprMax software and field test analysis. Ground penetrating radar (GPR) is used to detect cavities of different shapes filled with various media, focusing on cavity signals while reducing interference from I-beams, and reconstructing radar signals through migration. Statistical parameters are introduced for analysis, and techniques such as Fast Fourier Transform, generalized S-transform, and wavelet packet transform are employed to extract features from the processed radar signals. The characteristics of the filling medium in the cavity area are extracted from three aspects: frequency, time–frequency, and energy. This method can provide a reference for interpreting the GPR data of tunnel lining cavity filling media in actual engineering applications.
Tunnel lining cavities and other defects can cause cracks in tunnel structures and damage to concrete, seriously affecting the safety of driving in tunnels. Due to varying geological conditions, the materials filling different cavity areas in tunnels differ. By formulating corresponding repair measures for different fillers in cavity areas, many unnecessary losses can be avoided. Therefore, this paper proposes a method based on multi-parameter information for identifying and extracting the characteristics of different fillers in tunnel cavity areas through forward simulation using gprMax software and field test analysis. Ground penetrating radar (GPR) is used to detect cavities of different shapes filled with various media, focusing on cavity signals while reducing interference from I-beams, and reconstructing radar signals through migration. Statistical parameters are introduced for analysis, and techniques such as Fast Fourier Transform, generalized S-transform, and wavelet packet transform are employed to extract features from the processed radar signals. The characteristics of the filling medium in the cavity area are extracted from three aspects: frequency, time–frequency, and energy. This method can provide a reference for interpreting the GPR data of tunnel lining cavity filling media in actual engineering applications.
摘要：
Sepiolite (SEP), a naturally abundant and environmentally friendly clay mineral, possesses various active sites and a large specific surface area. In this work, peroxymonosulfate (PMS) was activated to remove tetracycline (TC) using modified Sepiolite (MSEP), which was synthesized by ball milling and calcination techniques. According to the findings, MSEP efficiently stimulated PMS to produce 1 O 2 and ·OH radicals for the degradation of TC, with 1 O 2 being a key component of this process. The findings demonstrated that the carbonate on the MSEP surface encouraged the production of singlet oxygen. ( 1 O 2 ). Under the conditions of pH 6.5, 0.2 g/L MSEP, 2 mmol/L PMS and 25 °C, a 10 mg/L TC concentration was reduced by 93.3 % after 30 min. The presence of Cl − and NO 3 − did not inhibit TC degradation, while HCO 3 − promoted it, and H 2 PO 4 − exhibited an inhibitory effect. This work offers a novel method for using clay minerals to activate PMS and degrade organic contaminant without secondary pollution.
Sepiolite (SEP), a naturally abundant and environmentally friendly clay mineral, possesses various active sites and a large specific surface area. In this work, peroxymonosulfate (PMS) was activated to remove tetracycline (TC) using modified Sepiolite (MSEP), which was synthesized by ball milling and calcination techniques. According to the findings, MSEP efficiently stimulated PMS to produce 1 O 2 and ·OH radicals for the degradation of TC, with 1 O 2 being a key component of this process. The findings demonstrated that the carbonate on the MSEP surface encouraged the production of singlet oxygen. ( 1 O 2 ). Under the conditions of pH 6.5, 0.2 g/L MSEP, 2 mmol/L PMS and 25 °C, a 10 mg/L TC concentration was reduced by 93.3 % after 30 min. The presence of Cl − and NO 3 − did not inhibit TC degradation, while HCO 3 − promoted it, and H 2 PO 4 − exhibited an inhibitory effect. This work offers a novel method for using clay minerals to activate PMS and degrade organic contaminant without secondary pollution.
通讯机构：
[Fu, SJ ] H;Hunan City Univ, Sch Mat & Chem Engn, Yiyang 413000, Peoples R China.;Coll Hunan Prov, Key Lab Low Carbon & Environm Funct Mat, Yiyang 413000, Peoples R China.
摘要：
The one-step oxidation of cyclohexane to KA-oil (a critical intermediate for ε-caprolactam and adipic acid synthesis) represents a formidable catalytic challenge. Herein, the highly stable Ce–Mn composite oxide (CeMnO x ) catalyst was prepared via the sol–gel method. Under optimal conditions, 7.7% cyclohexane conversion with 85.6% selectivity to KA-oil was acquired. Remarkably, CeMnO x retained its initial activity and structural integrity over 10 catalytic cycles. Comprehensive characterization revealed that the coexistence of multivalent Mn (Mn 3+ /Mn 2+ ) and Ce (Ce 4+ /Ce 3+ ) species enables synergistic redox interplay. This synergy critically directs the efficient decomposition/reduction of the cyclohexyl hydroperoxide (CHHP) intermediate, thereby enhancing the KA-oil yield. Integrated in situ DRIFTS studies and density functional theory calculations elucidated a radical-mediated reaction mechanism underpinned by the synergistic Ce–Mn couples. This work not only demonstrates a viable strategy for efficient single-step KA-oil production but also provides fundamental insights into designing selective oxidation catalysts for alkanes.
摘要：
External beam-column joints are generally recognized as critical components in ductile steel frame structures. The incorporation of minimally invasive and easily replaceable knee braces offers an effective retrofitting solution. This study investigates the feasibility of enhancing the seismic behavior of external beam-column joints in steel structures through the utilization of knee braces. The mechanical behavior of knee-braced retrofitted joints was analyzed to derive expressions for internal forces in the beam, column, and joint connection components. By utilizing principles of force balance and deformation compatibility between the beam, column, and joint components, a shear coefficient expression was formulated to quantify the knee brace’s impact on the internal forces within the beam and column. Furthermore, methods were developed to calculate the bending and shear capacities of the joint, as well as the axial capacity of the knee brace. The failure modes and sequences of the joint were predicted using a strength hierarchy evaluation method, and the validity of this approach was confirmed through experimental data from both retrofitted and non-retrofitted joints. Finally, the impact of critical design parameters, such as horizontal projection length, installation angle, and section type of the knee brace, on the strength hierarchy and failure modes of external steel frame joints was examined, providing valuable insights for the design of knee-braced retrofitted joints.
External beam-column joints are generally recognized as critical components in ductile steel frame structures. The incorporation of minimally invasive and easily replaceable knee braces offers an effective retrofitting solution. This study investigates the feasibility of enhancing the seismic behavior of external beam-column joints in steel structures through the utilization of knee braces. The mechanical behavior of knee-braced retrofitted joints was analyzed to derive expressions for internal forces in the beam, column, and joint connection components. By utilizing principles of force balance and deformation compatibility between the beam, column, and joint components, a shear coefficient expression was formulated to quantify the knee brace’s impact on the internal forces within the beam and column. Furthermore, methods were developed to calculate the bending and shear capacities of the joint, as well as the axial capacity of the knee brace. The failure modes and sequences of the joint were predicted using a strength hierarchy evaluation method, and the validity of this approach was confirmed through experimental data from both retrofitted and non-retrofitted joints. Finally, the impact of critical design parameters, such as horizontal projection length, installation angle, and section type of the knee brace, on the strength hierarchy and failure modes of external steel frame joints was examined, providing valuable insights for the design of knee-braced retrofitted joints.
摘要：
Wood, as an abundant and sustainable material, is highly regarded for its aesthetic appeal and versatility, making it a popular choice for architectural and furniture applications. Nevertheless, its high flammability presents a major safety hazard, severely restricting its use in fire-prone settings. In this work, we focus on extending the time to ignition (TTI) of wood by increasing the delay between contact with an ignition source and the formation of an open flame, rather than merely reducing the heat release rate (HRR) and smoke release rate (SRR) during combustion. This study investigates how magnesium ions (Mg 2+ ) promote the mineralization of CaCO 3 within wood, leading to the formation of magnesium calcium carbonate (Mg-CaCO 3 ) and magnesium calcite. During wood combustion, Mg-CaCO 3 underwent dehydration and phase transformation, promoting the nucleation and growth of Mg-calcite within the wood matrix. This process markedly enhanced the wood's fire-retardant properties and compressive strength. Compared to untreated wood, the mineralized wood demonstrated a 53 s delay in TTI, a 68.8 % reduction in the maximum heat release rate (HRR), and a 101.7 % increase in compressive strength. The facile self-densification and heat-induced mineralization processes, combined with a water evaporation strategy, significantly enhance both the fire-retardant properties and mechanical strength, offering a promising approach for the development of fire-resistant, high-strength structural materials.
Wood, as an abundant and sustainable material, is highly regarded for its aesthetic appeal and versatility, making it a popular choice for architectural and furniture applications. Nevertheless, its high flammability presents a major safety hazard, severely restricting its use in fire-prone settings. In this work, we focus on extending the time to ignition (TTI) of wood by increasing the delay between contact with an ignition source and the formation of an open flame, rather than merely reducing the heat release rate (HRR) and smoke release rate (SRR) during combustion. This study investigates how magnesium ions (Mg 2+ ) promote the mineralization of CaCO 3 within wood, leading to the formation of magnesium calcium carbonate (Mg-CaCO 3 ) and magnesium calcite. During wood combustion, Mg-CaCO 3 underwent dehydration and phase transformation, promoting the nucleation and growth of Mg-calcite within the wood matrix. This process markedly enhanced the wood's fire-retardant properties and compressive strength. Compared to untreated wood, the mineralized wood demonstrated a 53 s delay in TTI, a 68.8 % reduction in the maximum heat release rate (HRR), and a 101.7 % increase in compressive strength. The facile self-densification and heat-induced mineralization processes, combined with a water evaporation strategy, significantly enhance both the fire-retardant properties and mechanical strength, offering a promising approach for the development of fire-resistant, high-strength structural materials.
摘要：
To enhance the engineering properties of granite residual soil for subgrade filling, cement is incorporated to improve the soil. Through compaction tests, direct shear tests, and scanning electron microscope (SEM) tests, the influence of adding different doses of cement on the shear strength, residual strength, and microstructure of granite residual soil is investigated. The experimental results show that the maximum dry density increases and the optimal moisture content decreases with increasing cement content up to 7%. The shear strength is significantly enhanced with the increase in cement content. This effect is mainly attributed to the significant improvement in soil cohesion due to the addition of cement. When the cement content exceeds 7%, the shear strength index still increases with the cement content, but the rate of change slows down significantly. The failure mode of improved soil exhibits brittle failure, with residual strength remaining unchanged after cement content reaches 3%. At lower stress levels, the residual strength of the improved soil is similar to the shear strength of the undisturbed granite residual soil; while at higher stress levels, the residual strength of the improved soil is inferior to the shear strength of the undisturbed granite residual soil. SEM images reveal that cement hydration products gradually fill pores, forming a continuous spatial network structure. Considering both effectiveness and economic factors, the optimal cement content is approximately 5%. These findings contribute to a deeper understanding of the engineering properties of cement-improved granite residual soil and provide guidance for related engineering construction.
期刊：
JOURNAL OF SUPERCOMPUTING,2025年81(4):1-21 ISSN：0920-8542
通讯作者：
Jiang, H
作者机构：
[Ya, Jinhua] Jingdezhen Ceram Univ, Sch Design Art, Jingdezhen 333000, Peoples R China.;[Jiang, Hua] Hunan City Univ, Coll Fine Arts & Design, Yiyang 413000, Peoples R China.;[Milani, F.] Western Caspian Univ, Dept Mech & Math, Baku 1001, Azerbaijan.
通讯机构：
[Jiang, H ] H;Hunan City Univ, Coll Fine Arts & Design, Yiyang 413000, Peoples R China.
关键词：
Internet of Things (IoT);Energy consumption;IoT;Quantum dot;Printed circuit
摘要：
An Internet of Things (IoT) network is a graph where all nodes have the same number of links. IoT gadgets are distinct due to their limited battery capacities, short lifespans, and low sustainability. For active mode connectivity, these designs need to address a number of challenges, such as sustainable practices, effective power strategies, and quick data transmission. However, due to its widespread application in digital computer arithmetic processes, the printed device is considered one of the essential digital components of IoT circuits. To put it another way, low-power and IoT devices with longer battery life and low-power consumption may be used with the printed electronic device. As this is going on, quantum-dot cellular automata (QCA) technology is being utilized more and more to develop digital circuit systems that require less energy and are sustainable and occupied. Consequently, this study proposes a novel printed circuit with an arithmetic logic unit (ALU) structure. Implementing QCA technology emphasizes energy efficiency, sustainability, and occupied areas for miniaturizing IoT systems. Additionally, utilizing the QCADesigner-E 2.2 and QCAPro tools, all proposed frameworks are validated by simulation.
