作者机构：
[Wu, Kuan; Li, Shouyi; Wang, Feifei] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;[Zhang, Huijie] China Coal Res Inst, Mine Safety Technol Branch, Beijing 100013, Peoples R China.;[Li, Bo; You, Bo; Chen, Yong] Hunan Univ Sci & Technol, Coll Resources Environm & Safety Engn, Xiangtan 411100, Peoples R China.;[Ma, Heyi] Hunan Coal Sci Res Inst Co Ltd, Changsha 410000, Peoples R China.;[Chen, Yong] China Coal Sci & Ind Grp Co LTD, Chongqing Res Inst, Chongqing 400037, Peoples R China.
通讯机构：
[Wu, K ] H;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
摘要：
To study the initial characteristics of gas desorption in high-rank soft and hard coals, a purpose-built constant-temperature gas desorption device was used to conduct gas desorption experiments on three groups of collected high-rank soft and hard coal samples. The results show that the gas desorption index (K (1)) of drill cuttings from soft and hard coals follows a power function relationship with the adsorption equilibrium pressure. Under the same adsorption equilibrium pressure, the gas desorption index (K (1)) of drill cuttings from soft coal is 1.39-2.66 times that of hard coal. When the adsorption equilibrium pressure is 1 MPa, in the first 1 min, the gas desorption rate of soft coal is 1.38-2.56 times that of hard coal, and in the first 10 min, the gas desorption rate of soft coal is 1.35-2.49 times that of hard coal. The initial law of gas desorption in soft and hard coals is suitable for classifying Sun Zhongxu's form of the governing equation. To reveal the causes of the differences in the initial characteristics of high-rank soft and hard coal gas desorption from a microscopic perspective, scanning electron microscopy (SEM) was used to observe the surface pore structure of soft and hard coals. Additionally, mercury intrusion porosimetry (MIP) and low-temperature N(2) adsorption/desorption (LTN(2)GA) experiments were undertaken to ascertain the full pore size distribution of soft and hard coal samples. The results show that (1) the breccia pores on the surface of soft coal are more developed, and the pore connectivity is better, which provides favorable conditions for the rapid desorption of gas at the initial stage. Furthermore, the crushed grain pores and ink bottle pores on the surface of soft coal are more developed, providing a place for the adsorption of more gas; (2) the total pore capacity of soft coal is 4.12-10.57 times that of hard coal, and the proportion of large and medium pore capacity in soft coal is 4.47-10.70 times that of hard coal, which provides a favorable channel for the rapid desorption of gas in the initial stage. The ratio of medium and micropore specific surface area of soft coal is 2.26-2.77 times that of hard coal, offering more positions for gas adsorption. The results offer a reference for those seeking to understand the differences in gas desorption in the early stage of high-rank soft and hard coals and provide technical support for improving the accuracy of determining coalbed gas content and gas desorption index (K (1)) of drill cuttings.
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.
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.
摘要：
The shear failure of concrete is a sudden brittle failure, which is difficult to be forewarned. To investigate the shear crack mechanisms in concrete, this study first systematic compared acoustic emission (AE) behavior during direct shear tests, compression shear tests (Z-shaped specimens), and three point bending shear tests. AE parameters (amplitude, cumulative count and energy), average frequency (AF)-rise time/amplitude (RA) analysis, K-means clustering, and b-value analysis were integrated to classify cracks and characterize damage progression. The correlation between the shear crack propagation mechanism of concrete and AE parameters was revealed. The AE activity during concrete shear failure was successfully characterized, providing valuable insights into the damage development and evolution processes. The research findings establish a quantitative framework for using AE technology to detect shear cracks and monitor real-time damage evolution in concrete structures.
摘要：
The existence of multiple cracks accelerates chloride ion penetration within damaged concrete, substantially shortening the lifespan of the structure. Therefore, this paper conducts an in-depth analysis of chloride migration mechanisms in cracked concrete subjected to multiple cracks under drying-wetting cycles. Firstly, a series of accelerated chloride diffusion experiments were conducted on prestressed concrete beams subjected to multiple cracks. The analysis examines how crack width, depth, and density affect chloride concentration distribution. Then, a chloride diffusion coefficient prediction model incorporating the effects of multiple cracks was established using the crack interaction function and verified through experimental data. Finally, this paper explored the distribution patterns of chloride concentration and convection zones in concrete subjected to multiple cracks under various environmental conditions. The experimental results showed that crack width exerts the strongest effect on chloride diffusion, followed by crack depth, while crack density has the smallest impact. At the same depth of diffusion, the chloride concentration in concrete specimens with crack width of 0.3 mm increased by 45 % and 25 % on average compared with those with crack width of 0.1 mm and 0.2 mm, respectively. The dry-wet time ratio and initial moisture saturation significantly affect chloride concentration distribution, with the depth of the convection zone showing a negative correlation with initial moisture saturation.
The existence of multiple cracks accelerates chloride ion penetration within damaged concrete, substantially shortening the lifespan of the structure. Therefore, this paper conducts an in-depth analysis of chloride migration mechanisms in cracked concrete subjected to multiple cracks under drying-wetting cycles. Firstly, a series of accelerated chloride diffusion experiments were conducted on prestressed concrete beams subjected to multiple cracks. The analysis examines how crack width, depth, and density affect chloride concentration distribution. Then, a chloride diffusion coefficient prediction model incorporating the effects of multiple cracks was established using the crack interaction function and verified through experimental data. Finally, this paper explored the distribution patterns of chloride concentration and convection zones in concrete subjected to multiple cracks under various environmental conditions. The experimental results showed that crack width exerts the strongest effect on chloride diffusion, followed by crack depth, while crack density has the smallest impact. At the same depth of diffusion, the chloride concentration in concrete specimens with crack width of 0.3 mm increased by 45 % and 25 % on average compared with those with crack width of 0.1 mm and 0.2 mm, respectively. The dry-wet time ratio and initial moisture saturation significantly affect chloride concentration distribution, with the depth of the convection zone showing a negative correlation with initial moisture saturation.
作者机构：
[Cao, Ling; Huang, Zhiliang; Yin, Jiu; Li, Hangyang; Yang, Tongguang; Zhang, Tianying] Hunan City Univ, Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Peoples R China.;[Wang, Huaixing] Huizhou Liwinon New Energy Technol Co Ltd, Huizhou 516123, Peoples R China.;[Zhang, Rongchuan] Wuhan Second Ship Design & Res Inst, Wuhan 430200, Peoples R China.
通讯机构：
[Huang, ZL ] H;Hunan City Univ, Key Lab Energy Monitoring & Edge Comp Smart City, Yiyang 413002, Peoples R China.
关键词：
Gas production rate;Inverse identification algorithm;Lithium-ion battery;Multiple-field analytical model;Thermal abuse
摘要：
Conventional lithium-ion cell state models assume a constant gas production rate for each chemical reaction, reducing the prediction accuracy of thermal and mechanical states. The heat and gas evolution in cells involves a strongly-nonlinear dynamic process, and existing studies lack precise identification methods for dynamic gas production rates. This study proposes an identification approach for temperature-dependent gas production rates of pouch lithium-ion cells. A simple and low-cost experiment for the inverse calculation is designed to capture the temperature and height data of cells under thermal abuse conditions. A gas production analytical model is created, coupling chemical reaction, thermal circuit, and thermodynamic sub-models. An inverse model is formulated to identify the temperature-dependent gas production rate of each reaction. An equal-volume-change sequential searching algorithm is presented to suppress numerical oscillations caused by minor and abrupt responses. Numerical and experimental results from two commercial lithium-ion cells validate the performance of the proposed approach. The results show that this approach identifies the nonlinear relationship between gas production rates and core temperature. The second-level efficiency and robust convergence support this approach as an effective tool for accurately identifying gas production rates in cell state evaluation models. Identifying dynamic gas production rates can significantly enhance the precision of state prediction for lithiumion batteries, which is crucial for ensuring the safety of battery packs during service.
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.
期刊：
Journal of Pipeline Systems Engineering and Practice,2025年16(3):03125001 ISSN：1949-1190
通讯作者：
Hu, D
作者机构：
[Qi, Kai; Yang, Xian; Liang, Xiaoqiang; Hu, Da; Li, Yongsuo; Hu, D] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, 518 Yingbin East Rd, Yiyang 413000, Peoples R China.;[Xiang, Xuejuan; Qi, Kai; Huang, Junjie] Hunan City Univ, Sch Civil Engn, 518 Yingbin East Rd, Yiyang 413000, Peoples R China.
通讯机构：
[Hu, D ] H;Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, 518 Yingbin East Rd, Yiyang 413000, Peoples R China.
关键词：
Rectangular top pipe tunnel;Experimental analysis method;Empirical formula method;Numerical simulation method;Theoretical analysis method
摘要：
The jacking force in the construction process of rectangular pipe jacking tunnels is characterized by its intermittent, discontinuous, and unstable nature. This force not only determines the speed of tunneling but also controls the rate at which soil stress is released, leading to deformation of the formation and land subsidence, thereby impacting the surrounding environment. To accurately calculate and predict the jacking force of rectangular pipe jacking tunnels, this study conducts a comprehensive investigation and analysis of relevant literature on the calculation methods employed both domestically and internationally. The calculation methods are categorized into four types: experimental analysis methods, numerical simulation methods, theoretical formula methods, and empirical formula methods. The research content of each of these methods is analyzed and organized, and the existing research is summarized in terms of its problems and shortcomings. Furthermore, suggestions for future research on the calculation method of the jacking force are proposed, aiming to provide a technical reference for the theoretical research and engineering practice of calculating and predicting the jacking force of rectangular pipe jacking tunnels.
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.
期刊：
Journal of Mining Science,2025年61(1):71-79 ISSN：1062-7391
通讯作者：
Wang, FF
作者机构：
[Wang, Feifei] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;[Wang, Feifei] Hunan City Univ, Key Lab Green Bldg & Intelligent Construct Higher, Yiyang 413000, Peoples R China.
通讯机构：
[Wang, FF ] H;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;Hunan City Univ, Key Lab Green Bldg & Intelligent Construct Higher, Yiyang 413000, Peoples R China.
关键词：
mining engineering;underground goaf;high-cold and high-altitude;landslide and collapse;disaster formation mechanism
摘要：
In order to study the formation mechanism of the high-cold and high-altitude mountain collapse disaster caused by underlying complex goaf group, the lithology, occurrence of structural planes in rock mass and hydrological conditions of overburden in goaf were obtained through field investigation. Combined with the field investigation results, the landslide disaster mechanism was comprehensively analyzed. The stability of the mountain slope in the underlying goaf and the potential slip arc surface of the collapse body are analyzed by the two-dimensional finite element analysis method. The main causes of surface collapse of mountain slope are: the steep structural plane of rock mass, rainfall and fissure water erosion, freeze-thaw cycle, underground ore body mining disturbance, etc. Geological conditions are the internal cause, while underground mining is the inducement. The combined action of the internal and external causes leads to the special formation mechanism of collapse.
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.
期刊：
Movement Ecology,2025年13(1):1-14 ISSN：2051-3933
通讯作者：
Cao, L
作者机构：
[Cao, Lei; Zhang, Junjian] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing, Peoples R China.;[Li, Xianghuang] Minist Nat Resources, East China Sea Survey Ctr, Shanghai, Peoples R China.;[Deng, Xueqin] Minist Ecol & Environm, Ctr Environm Educ & Commun CEEC, Beijing, Peoples R China.;[Damba, Iderbat] Mongolian Acad Sci, Inst Biol, Ulaanbaatar, Mongolia.;[Batbayar, Nyambayar] Wildlife Sci & Conservat Ctr, B-1301 Union Bldg, Ulaanbaatar, Mongolia.
通讯机构：
[Cao, L ] C;Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing, Peoples R China.;Univ Chinese Acad Sci, Beijing, Peoples R China.
摘要：
Migratory phenology affects fitness and therefore plays a crucial role in the annual life cycle of migrants. Various indicators in relation to the migration patterns of Arctic nesting birds have been well studied (e.g. vegetation production), but we still lack knowledge from lower latitudes, e.g. the Mongolian Plateau, which is one of the top-priority regions for avian research and conservation. We used 208 spring and 248 autumn migration tracks from individually tagged Swan Geese Anser cygnoides (SG) and Greylag Geese A. anser (GG) from four geographically discrete breeding groups across the Mongolian Plateau. We analyzed the difference in their migratory timing, how they responded to nine environmental metrics as indicators of environmental change, and the probability of spring arrival and autumn departure. We found significant differences in spring and autumn departure times between species, yet their arrival times were similar, although the migration phenology of eastern nesting birds differed significantly from those in central and western Mongolia. Their spring migration followed the onset of daily temperature reaching 0 °C, but was not correlated with indices of plant green-up, which occurred behind them along their migration routes. The autumn departure phenology of SG exhibited stronger responses to 0 °C nighttime temperatures, while the GG responded more to 0 °C cumulative temperatures. Two goose species follow behind the daily 0 °C and before the green-up of plants in spring, allowing the time of hatching of goslings to coincide with the plant growth peak, ensuring a predictable food supply for the nidifugous juveniles. Vegetation and snow metrics were not appropriate indicators to predict the migration process of either species, due to the lack of strong latitudinal gradients in plant growth and long-term snow cover.
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：
Enhancing the stability and durability of superhydrophobic wood remains a significant challenge for its long-term application in various fields. This study presents a novel approach to developing durable superhydrophobic wood by regulating wood structure. The analyses of the mechanism revealed that Si-Ti@PDMS prepolymer infiltrated wood’s pores and cell walls, forming a highly cross-linked micro-nanoscale superhydrophobic coating extending from the exterior to the interior. The resulting superhydrophobic wood exhibited excellent hydrophobic characteristics on both its surface and various cutting surfaces. Furthermore, the water contact angles (WCA) measured on the various cut surfaces of the wood consistently exceeded 150°, thereby confirming its superhydrophobicity. Additionally, the water contact angles (WCA) at wood depth surfaces remained above 130°. This observation indicates that the non-wettability characteristic of the superhydrophobic wood extends from the surface to the interior. Consequently, even in the event of surface structural damage, the wood retains its robust hydrophobic performance. This study provides a theoretical foundation for regulating durable superhydrophobic wood, and it was beneficial to the efficient use of superhydrophobic wood in construction and furniture fields.
Enhancing the stability and durability of superhydrophobic wood remains a significant challenge for its long-term application in various fields. This study presents a novel approach to developing durable superhydrophobic wood by regulating wood structure. The analyses of the mechanism revealed that Si-Ti@PDMS prepolymer infiltrated wood’s pores and cell walls, forming a highly cross-linked micro-nanoscale superhydrophobic coating extending from the exterior to the interior. The resulting superhydrophobic wood exhibited excellent hydrophobic characteristics on both its surface and various cutting surfaces. Furthermore, the water contact angles (WCA) measured on the various cut surfaces of the wood consistently exceeded 150°, thereby confirming its superhydrophobicity. Additionally, the water contact angles (WCA) at wood depth surfaces remained above 130°. This observation indicates that the non-wettability characteristic of the superhydrophobic wood extends from the surface to the interior. Consequently, even in the event of surface structural damage, the wood retains its robust hydrophobic performance. This study provides a theoretical foundation for regulating durable superhydrophobic wood, and it was beneficial to the efficient use of superhydrophobic wood in construction and furniture fields.
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：
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：
Refrigeration technology provides a new method for preventing coal and gas protrusions. In this study, the freeze-thaw characteristics of gas-containing coal under various moisture conditions (0%–20%) were investigated through experiments conducted on an independently constructed freeze-thaw simulation platform for gas-containing coal. The results mainly include: 1) The cooling curves of externally watered coal samples exhibit four stages: rapid cooling, constant phase change, slow cooling and final constant temperature. The dry coal samples showed only rapid cooling, followed by temperature stabilization. 2) Freezing deformation occurred only when the moisture content exceeded 8%, and a “hysteresis” effect appeared in its temperature and deformation. 3) Under the same humidity conditions, the gas-containing coals produced significantly greater freezing strain than the non-gas-containing coals. The duration of the freeze-up deformation increases linearly with the increase in moisture content; the duration of the gas-containing coal is longer. 4) The residual strain after freeze-up is in a logarithmic function relationship with the moisture content. The freezing and expansion forces destroyed the pore structure, connecting medium-sized pores into large pores, and simultaneously generated new micropores, resulting in a significant increase in the proportion of large pores. These results indicate that moisture, temperature, and gas presence synergistically control the freeze-up deformation characteristics of coal, providing important insights into the application of freezing technology to coal and the intrinsic mechanisms of gas outbreak prevention.
期刊：
POLISH JOURNAL OF ENVIRONMENTAL STUDIES,2025年34(4):3577-3592 ISSN：1230-1485
通讯作者：
Chen, Y
作者机构：
[Chen, Yu] Hunan City Univ, Coll Architecture & Urban Planning, Yiyang 413000, Peoples R China.;[Zhang, Mengmiao; Chen, Yu; He, Shaoyao] Hunan Univ, Sch Architecture & Planning, Changsha 410000, Peoples R China.;[Chen, Yu] Hunan Key Lab Key Technol Digital Urban & Rural Sp, Yiyang 413000, Peoples R China.;[Cai, Yan] Hunan City Univ, Sch Humanities, Yiyang 413000, Peoples R China.
通讯机构：
[Chen, Y ] H;Hunan City Univ, Coll Architecture & Urban Planning, Yiyang 413000, Peoples R China.;Hunan Univ, Sch Architecture & Planning, Changsha 410000, Peoples R China.;Hunan Key Lab Key Technol Digital Urban & Rural Sp, Yiyang 413000, Peoples R China.
关键词：
healthy urban space;long and short term memory;neural network;air quality;pollutant concentration
摘要：
With the improvement of people's living standards, more people are concerned about the air quality and safety of residential cities, and the concept of healthy urban space is gradually becoming deeply rooted in people's hearts. This study is based on long and short term memory neural network algorithms, incorporating AMs into them. The research adjusts the data input to the algorithm according to spatiotemporal characteristics and incorporates a stack-type self-coding network into an improved long and short term memory neural network to predict the concentration of urban air pollutants. The air pollutant data of Changsha-Zhuzhou-Xiangtan is used to test the model, and the test results are as follows: The index values of the mean absolute error and coefficient of determination of the intelligent prediction model with all improvement measures in the test set are 4.0 and 0.94, respectively, which is significantly better than the traditional and partially improved long and short term memory neural network. The algorithm model with complete improvement measures is selected for comparative experiments with other recurrent neural networks. This experimental result shows that the overall fluctuation amplitude of this model is the smallest under various test sample numbers. The mean absolute error and root-mean-square error on the whole test set are 6.7 and 9.2, respectively, which are and the memory consumption is also lower. The experimental data proves that this model, combined with an expert experience system, has the potential to be applied to urban air pollutant prediction and health risk assessment.
摘要：
Karst collapse, a sudden geological hazard with complex mechanisms and low predictability, presents significant threats to urban safety and sustainable development by jeopardizing human lives and infrastructure. To address the limitations of conventional prediction methods, in this study, we introduce an enhanced predictive model, the improved sparrow search algorithm-optimized extreme learning machine (ISSA-ELM), for accurate karst-collapse susceptibility assessment. The methodology incorporates two key innovations: first, it applies a Singer chaotic mapping technique to enhance the sparrow search algorithm (SSA), effectively mitigating local optima entrapment by increasing population diversity and enhancing global search capabilities. Second, the optimized ISSA automatically adjusts the initial weights and thresholds of the ELM, whereas a five-fold cross-validation is used to determine the optimal hidden layer configuration, forming an adaptive and intelligent prediction framework. When validated against 20 datasets from a representative karst region, the proposed model achieved exceptional performance, with a mean absolute error (MAE) of 0.0544 and a coefficient of determination (R 2 ) of 0.9914, significantly surpassing the prediction accuracy of conventional ELM and SSA-ELM models. The results underscore the ISSA-ELM’s superior nonlinear fitting capability, enhanced generalization performance, and outstanding stability in practical engineering applications. This research offers a solid scientific foundation for risk classification and hazard mitigation strategies while introducing a novel methodological framework through the integration of innovative algorithms. The proposed technical pathway provides significant theoretical advancements and practical engineering values for geological disaster prediction systems.
摘要：
The inadequate wear durability of CoCrFeNiMo high-entropy alloy coatings poses great challenges to achieving reliable surface protection for engineering components. This study strategically addresses this limitation by incorporating ceramic carbide particles. The pure CoCrFeNiMo (P0), CoCrFeNiMo-10wt%Cr 3 C 2 (CrC10), and CoCrFeNiMo-10wt%B 4 C (BC10) composite coatings were deposited onto Q235 substrate utilizing laser cladding. Those coatings' structural characteristics, mechanical properties, tribological behavior, and wear mechanisms were analyzed and compared. The P0 coating was composed of FCC and σ phases with a herringbone-like hierarchical eutectic structure, showing good fracture toughness (10.7–24.61 MPa·m 1/2 ). The Cr 3 C 2 -added coating had a typical dendrite structure, and the primary phase from FCC gradually transformed upward into the σ phase. Adding B 4 C particles induced plenty of carbides and borides precipitation such as MoC, M 7 C 3 , and Fe 3 (B, C) in BC10 coating. Adding carbide particles promoted the solid solution strengthening of C and B atoms and in-situ precipitation of reinforcement phases, significantly enhancing the hardness. The hardnesses of P0, CrC10, and BC10 coatings were 652.8, 744.3, and 1162.1 HV 0.2 , respectively. Benefiting from the synergistic effect of the Mo-rich hardening phase and lubricating oxide layer, the BC10 coating achieved the lowest wear rate (9.8 × 10 −6 mm 3 ·N −1 ·m −1 ), showing an order-of-magnitude improvement over the P0 and CrC10 coatings. The P0 and CrC10 coatings predominantly exhibited abrasive wear modes. Surprisingly, the worn surface of the BC10 coating was very slight without detectable scratches or delamination, which was dominated by oxidative wear.
The inadequate wear durability of CoCrFeNiMo high-entropy alloy coatings poses great challenges to achieving reliable surface protection for engineering components. This study strategically addresses this limitation by incorporating ceramic carbide particles. The pure CoCrFeNiMo (P0), CoCrFeNiMo-10wt%Cr 3 C 2 (CrC10), and CoCrFeNiMo-10wt%B 4 C (BC10) composite coatings were deposited onto Q235 substrate utilizing laser cladding. Those coatings' structural characteristics, mechanical properties, tribological behavior, and wear mechanisms were analyzed and compared. The P0 coating was composed of FCC and σ phases with a herringbone-like hierarchical eutectic structure, showing good fracture toughness (10.7–24.61 MPa·m 1/2 ). The Cr 3 C 2 -added coating had a typical dendrite structure, and the primary phase from FCC gradually transformed upward into the σ phase. Adding B 4 C particles induced plenty of carbides and borides precipitation such as MoC, M 7 C 3 , and Fe 3 (B, C) in BC10 coating. Adding carbide particles promoted the solid solution strengthening of C and B atoms and in-situ precipitation of reinforcement phases, significantly enhancing the hardness. The hardnesses of P0, CrC10, and BC10 coatings were 652.8, 744.3, and 1162.1 HV 0.2 , respectively. Benefiting from the synergistic effect of the Mo-rich hardening phase and lubricating oxide layer, the BC10 coating achieved the lowest wear rate (9.8 × 10 −6 mm 3 ·N −1 ·m −1 ), showing an order-of-magnitude improvement over the P0 and CrC10 coatings. The P0 and CrC10 coatings predominantly exhibited abrasive wear modes. Surprisingly, the worn surface of the BC10 coating was very slight without detectable scratches or delamination, which was dominated by oxidative wear.
