期刊：
Journal of Materials Science: Materials in Electronics,2025年36(22):1-18 ISSN：0957-4522
通讯作者：
Wang, HO;Tan, WS
作者机构：
[Wang, Haiou; Zhao, Bojun; Wang, Haochen] Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices, Key Lab Hunan Prov, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.
通讯机构：
[Wang, HO ; Tan, WS ] H;Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices, Key Lab Hunan Prov, Yiyang 413002, Peoples R China.;Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.
摘要：
Cesium tin iodide (CsSnI3) is a promising lead-free alternative to traditional lead-based perovskites due to its superior optoelectronic properties and eco-friendly nature. However, its structural instability and the propensity of tin (Sn) to oxidize pose significant challenges. In this work, we address these issues by fine-tuning the synthesis parameters of CsSnI3. We adjusted the precursor feed ratio to 1.1:1 (CsI to SnI2) and incorporated 2% by mass of tin powder. This modification optimizes the crystal structure of CsSnI3 and maintains its chemical purity without requiring complex procedures. Our method significantly improves stability, by doubling the time of phase transition under vacuum compared to conventional samples. Additionally, the material shows enhanced stability in air, reducing the formation of the undesirable black perovskite phase, Cs2SnI6. The increased A-site Cs ions refine the structural framework of CsSnI3, preventing spontaneous collapse, while the B-site Sn powder mitigates internal Jahn-Teller distortion and affects the formation environment of Cs2SnI6. These combined additions result in improved performance. We discuss the underlying mechanisms of structure and phase transition, highlighting this formulation's potential as an optimal approach for synthesizing CsSnI3. This study paves the way for developing more stable and efficient lead-free perovskite materials for optoelectronic applications.
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：
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.
摘要：
The critical width-height ratio is a crucial parameter for defining the fill behind the wall as finite soil. Most existing studies on the critical width-height ratio of finite soil use loose sand as filler, without considering the influence of fill compaction degree on the critical width-height ratio of finite soil. By using of model test and numerical simulation, this paper studies the influence of compaction degree of fill behind the retaining wall on the active failure characteristics and the critical width-height ratio of finite soil under TT mode. The empirical relation between compaction degree and density, as well as the compaction degree and internal friction angle of fill materials is established through geotechnical tests. The dynamic development law on active fracture surface of the soil filling with different compaction degrees and width-height ratios behind the retaining wall is obtained. The method of determining the critical width-height ratio of the finite soil mass based on the morphological characteristics of fracture surface is proposed. The empirical formula of the critical width-height ratio of finite soil mass considering the compaction degree of fill is given. Under the TT mode, for the finite soil, the active fracture surface is a multi-segment broken line, starting from the heel of the movable retaining wall and going back and forth between the fixed retaining wall and the movable retaining wall, and ending at the fill surface; for the semi-infinite soil, the active fracture surface is an approximate straight line from the wall heel to the fill surface. For finite soil with a certain width-height ratio, with the increase of compaction degree, the active fracture surface gradually changes from a broken line to a straight line; the finite soil gradually becomes semi-infinite soil. For semi-infinite soil with a certain width-height ratio, with the increase of the compaction degree, the active fracture surface gradually becomes steeper, and the volume of the broken body gradually decreases; the soil behind the wall is still semi-infinite. When the compaction degree is constant, with the increase of the width-height ratio, the active fracture surface gradually changes from a broken line to a straight line, and the finite soil behind the wall gradually changes to semi-infinite soil. Under the TT mode, the active failure critical width-height ratio of finite soil decreases linearly with the increase of the compaction degree of fill, showing a highly linear correlation. The compaction degree of backfill is one of the important factors affecting the critical width-height ratio, which should be considered in the design and construction of actual support engineering. The study is of great significance for determining the critical width-height ratio of finite soil behind the retaining wall, and can provide a reference for the deformation analysis and earth pressure calculation of the finite soil behind the retaining structure.
作者机构：
School of Mechanical and Electrical Engineering, Hunan City University, Hunan, Yiyang, 413000, China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan, 243002, China
关键词：
Aluminum coatings;Aluminum compounds;Brinell Hardness;Chromate coatings;Rockwell hardness;Wear of materials;Cr content;Dry friction;High Cr content;High temperature wear;Highest temperature;Mechanical;Oxide coating;Property;Tribological behaviour;Wear mechanisms;Wear resistance
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：
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：
In view of the problems in the existing methods such as large retrieval error, low data positioning accuracy, and long retrieval time, this paper proposes an intelligent retrieval method for book resources in smart libraries based on RFID. First, complete the rough extraction of the features of the book resources in the smart library. Then, set the length rule of book resource features, eliminate ambiguous data, determine the similarity of book resource features, and merge similar features through similar probability mapping. Finally, complete the feature data authentication, set the tag with RFID tag technology, locate the tag data location, build the book resource index tree, and determine the intelligent retrieval model. The test results show that the proposed method can reduce the intelligent retrieval error of book resources in smart libraries, improve the accuracy of data location, and reduce the retrieval time cost.
摘要：
Urban resilience evaluates systems’ capacities to prepare for, adapt to, absorb, and recover from disruptions. Evaluation frameworks incorporate metrics like recovery speed, adaptive ability, and absorptive capacity. Assessing critical infrastructure interdependencies is challenging yet vital to limit failure propagation. While static assessments, multi-layer frameworks, and software like Hazus are used, limitations persist. Machine learning often focuses on infrastructure data for recovery monitoring. A common workflow entails acquiring and organizing data, then applying supervised, unsupervised, or reinforcement learning models. Supervised learning uses labeled data while unsupervised learning detects patterns in unlabeled data. Reinforcement learning optimizes rewards through trial-and-error interactions. Machine learning assists in meeting intensifying urbanization and climate change challenges. Leveraging advances in sensors, IoT, and computing enables tasks like image labeling and semantic segmentation. The techniques facilitate resilience through real-time data analytics for informed decision-making and responsive disaster management.
Urban resilience evaluates systems’ capacities to prepare for, adapt to, absorb, and recover from disruptions. Evaluation frameworks incorporate metrics like recovery speed, adaptive ability, and absorptive capacity. Assessing critical infrastructure interdependencies is challenging yet vital to limit failure propagation. While static assessments, multi-layer frameworks, and software like Hazus are used, limitations persist. Machine learning often focuses on infrastructure data for recovery monitoring. A common workflow entails acquiring and organizing data, then applying supervised, unsupervised, or reinforcement learning models. Supervised learning uses labeled data while unsupervised learning detects patterns in unlabeled data. Reinforcement learning optimizes rewards through trial-and-error interactions. Machine learning assists in meeting intensifying urbanization and climate change challenges. Leveraging advances in sensors, IoT, and computing enables tasks like image labeling and semantic segmentation. The techniques facilitate resilience through real-time data analytics for informed decision-making and responsive disaster management.
通讯机构：
[Liu, Q ] C;[Yi, WJ; Li, XJ ] N;Natl Univ Def Technol, Coll Sci, Changsha, Peoples R China.;Chinese Peoples Liberat Army Gen Hosp, Chinese PLA Med Sch, Sr Dept Otolaryngol Head & Neck Surg, Med Ctr 6, Beijing, Peoples R China.
摘要：
The fundamental trade-off between spatial resolution and imaging distance poses a significant challenge for current imaging techniques, such as those used in modern biomedical diagnosis and remote sensing. Here, we introduce a new conceptual method for imaging dynamic amplitude-phase-mixed objects, termed relay-projection microscopic telescopy (rPMT), which fundamentally challenges conventional light collection techniques by employing non-line-of-sight light collection through square-law relay-projection mechanisms. We successfully resolved tiny features measuring 2.76 μm, 22.10 μm, and 35.08 μm for objects positioned at distances of 1019.0 mm, 26.4 m, and 96.0 m, respectively, from single-shot spatial power spectrum images captured on the relay screen; these results demonstrate that the resolution capabilities of rPMT significantly surpass the Abbe diffraction limit of the 25 mm-aperture camera lens at the respective distances, achieving resolution improvement factors of 7.9, 25.4, and 58.2. The rPMT exhibits long-distance, wide-range, high-resolution imaging capabilities that exceed the diffraction limit of the camera lens and the focusing range limit, even when the objects are obscured by a scattering medium. The rPMT enables telescopic imaging from centimeters to beyond hundreds of meters with micrometer-scale resolution using simple devices, including a laser diode, a portable camera, and a diffusely reflecting whiteboard. Unlike contemporary high-resolution imaging techniques, our method does not require labeling reagents, wavefront modulation, synthetic receive aperture, or ptychography scanning, which significantly reduce the complexity of the imaging system and enhance the application practicality. This method holds particular promise for in-vivo label-free dynamic biomedical microscopic imaging diagnosis and remote surveillance of small objects. This imaging method exceeds the diffraction limit of the camera lens used, achieving resolution improvement factors of 7.9, 25.4, and 58.2 for objects at distances of 1019.0 mm, 26.4 m, and 96.0 m.
摘要：
Efficient removal of uranium(VI) from radioactive wastewater is of critical importance for sustainable utilization of uranium resources and environmental protection against uranium contamination. In this work, we report a dual–function heterojunction of CdS/ZnO for visible light-driven photocatalysis assisted with adsorption, where CdS/ZnO-140 not only accelerates reaction kinetics but also enhances overall U(VI) removal efficiency by confining adsorbed U(VI) near catalytic sites. Furthermore, CdS/ZnO composites were prepared via a facile hydrothermal method , and the effects of hydrothermal temperature on U(VI) removal performance under visible light were systematically investigated. Compared with the pristine CdS and ZnO nanoparticles , the CdS/ZnO heterojunctions exhibit higher removal performances, attributed to the introduction of ZnO component that significantly improves both adsorption capacity and spatial separation efficiency of photo-generated electron-hole pairs. More importantly, different key factors including band gap, energy level, crystallinity , specific surface area , adsorption kinetics and radical generation amount were taken into account for structure–performance investigation of U(VI) photocatalytic removal. Notably, the CdS/ZnO-140 composite exhibits superior U(VI) removal efficiency, outperforming counterparts synthesized at 100 °C and 180 °C. The investigations reveal that the enhanced U(VI) removal activity of CdS/ZnO-140 could be correlated with the efficient charge separation and migration, carrier dynamics, and surface active sites. By elucidating the role of hydrothermal temperature in tuning carrier dynamics and surface reactivity, we provide insights for designing heterojunction photocatalysts with tailored adsorption and redox functionalities.
Efficient removal of uranium(VI) from radioactive wastewater is of critical importance for sustainable utilization of uranium resources and environmental protection against uranium contamination. In this work, we report a dual–function heterojunction of CdS/ZnO for visible light-driven photocatalysis assisted with adsorption, where CdS/ZnO-140 not only accelerates reaction kinetics but also enhances overall U(VI) removal efficiency by confining adsorbed U(VI) near catalytic sites. Furthermore, CdS/ZnO composites were prepared via a facile hydrothermal method , and the effects of hydrothermal temperature on U(VI) removal performance under visible light were systematically investigated. Compared with the pristine CdS and ZnO nanoparticles , the CdS/ZnO heterojunctions exhibit higher removal performances, attributed to the introduction of ZnO component that significantly improves both adsorption capacity and spatial separation efficiency of photo-generated electron-hole pairs. More importantly, different key factors including band gap, energy level, crystallinity , specific surface area , adsorption kinetics and radical generation amount were taken into account for structure–performance investigation of U(VI) photocatalytic removal. Notably, the CdS/ZnO-140 composite exhibits superior U(VI) removal efficiency, outperforming counterparts synthesized at 100 °C and 180 °C. The investigations reveal that the enhanced U(VI) removal activity of CdS/ZnO-140 could be correlated with the efficient charge separation and migration, carrier dynamics, and surface active sites. By elucidating the role of hydrothermal temperature in tuning carrier dynamics and surface reactivity, we provide insights for designing heterojunction photocatalysts with tailored adsorption and redox functionalities.
