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Cumulative damage characteristics of fully grouted GFRP bolts in rock under blasting dynamic loads

Journal of Mountain science 2025年第5期22卷 1871-1887页

作者： WANG Wenjie SONG Jiale LIU Chao YU Longzhe KABILA Kevin School of Resources and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan 430081China

In the civil and mining industries,bolts are critical components of support systems,playing a vital role in ensuring their *** fibre reinforced polymer(GFRP)bolts are widely used because they are corrosion-resistant and ***,the damage mechanisms of GFRP bolts under blasting dynamic loads are still unclear,especially compared to metal *** study investigates the cumulative damage of fully grouted GFRP bolts under blasting dynamic *** maximum axial stress at the tails of the bolts is defined as the damage variable,based on the failure characteristics of GFRP *** combining this with Miner's cumulative damage theory,a comprehensive theoretical and numerical model is established to calculate cumulative *** data collected from the Jinchuan No.3 Mining Area,including GFRP bolts parameters and blasting vibration data are used for further analysis of cumulative damage in fully grouted GFRP *** indicate that with an increasing number of blasts,axial stress increases in all parts of GFRP *** tail exhibits the most significant rise,with stress extending deeper into the anchorage *** damage follows an exponential trend with the number of blasts,although the incremental damage per blast decelerates over *** dynamic load intensities accelerate damage accumulation,leading to an exponential decline in the maximum loading cycles before ***,stronger surrounding rock and grout mitigate damage accumulation,with the effect of surrounding rock strength being more pronounced than that of *** contrast,the maximum axial stress of metal bolts increases quickly to a certain point and then *** shows a clear difference between GFRP and metal *** study presents a new cumulative damage theory that underpins the design of GFRP bolt support systems under blasting conditions,identifies key damage factors,and suggests mitigation measures to enhance system stability.

关键词： Blasting dynamic load Fully grouted GFRP bolt Cumulative damage Axial stress

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FeNi alloys incorporated N-doped carbon nanotubes as efficient bifunctional electrocatalyst with phase-dependent activity for oxygen and hydrogen evolution reactions

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Journal of Materials science & technology 2024年第34期201卷 157-165页

作者： Yu Zhang Boyuan Chen Yanxin Qiao Yurong Duan Xinyu Qi Siqi He Hu Zhou Junkang Chen Aihua Yuan Shunli Zheng School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China College&Hospital of Stomatology Key Laboratory of Oral Diseases Research of Anhui ProvinceAnhui Medical UniversityHefei 230032China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Instrumental Analysis Center of Jiangsu University of Science and Technology Zhenjiang 212003China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Electrochemical oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)are two impor-tant half-cell reactions for overall water *** rational design and fabrication of efficient electro-catalysts involving nonprecious-metals and carbon matrix is highly ***,a series of N-doped carbon nanotubes encapsulated FeNi alloy nanoparticles(FeNi@NCNTs)are synthesized via a simple py-rolysis treatment of Fe-doped Ni(OH)_(2)precursors under the assistance of dicyandiamine *** re-sults reveal that the Fe/Ni ratio has an obvious influence on the morphology and phase composition of FeNi@NCNTs series,thus affecting the electrocatalytic *** highest electrocatalytic activity is achieved for the Fe1 Ni4@NCNTs product with a Fe/Ni molar ratio of 1:4,which delivers low overpoten-tials of 278 and 279 mV for OER and HER at 10 mA cm^(−2)in 1.0 mol/L KOH,*** intriguing electrocatalytic performance is mainly ascribed to the advantageous integration of rambutan-like hier-archically porous structure and composition optimization,significantly facilitating the fast mass/charge transfer as well as promoting the adsorption ability for *** present method may open a facile avenue for developing cost-effective,high-activity,and stable electrocatalysts for the application of overall water splitting.

关键词： Electrocatalysts FeNi alloy Carbon nanotubes Oxygen evolution reaction Hydrogen evolution reaction

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All-inorganic TiO_(2)/Cs_(2)AgBiBr_(6) composite as highly efficient photocatalyst under visible light irradiation

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Frontiers of Chemical science and engineering 2023年第12期17卷 1925-1936页

作者： Jianzhong Ma Lu Wen Qianqian Fan Siying Wei Xueyun Hu Fan Yang College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China College of Chemistry and Chemical Engineering Shaanxi University of Science and TechnologyXi’an 710021China Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry(Ministry of Education) Shaanxi University of Science and TechnologyXi’an 710021China Xi’an Key Laboratory of Green Chemicals and Functional Materials Shaanxi University of Science and TechnologyXi’an 710021China College of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

In recent years, limited photocatalysis efficiency and wide band gap have hindered the application of TiO_(2) in the field of photocatalysis. A leading star in photocatalysis has been revealed as lead-free Cs_(2)AgBiBr_(6) double halide perovskite nanocrystals, owing to its strong visible light absorption and tunable band gap. In this work, this photocatalytic process was facilitated by a unique TiO_(2)/Cs_(2)AgBiBr_(6) composite, which was identified as an S-cheme heterojunction. TiO_(2)/Cs_(2)AgBiBr_(6) composite was investigated for its structure and photocatalytic behavior. The results showed that when the perovskite dosage is 40%, the photocatalytic rate of TiO_(2) could be boosted to 0.1369 min^(-1). This paper discusses and proposes the band gap matching, carrier separation, and photocatalytic mechanism of TiO_(2)/Cs_(2)AgBiBr_(6) composites, which will facilitate the generation of new ideas for improving TiO_(2)’s photocatalytic performance.

关键词： Cs_(2)AgBiBr_(6)nanocrystals visible-light photocatalyst Cs_(2)AgBiBr_(6) TiO_(2)heterojunction

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Spatiotemporal distribution and diversity of microplastics in the sediment of beaches in Xiamen City,China

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Journal of Oceanology and Limnology 2025年第2期43卷 396-405页

作者： Fengrun WU Xueyan LI Chengyi ZHANG Tao WANG School of Environmental Science and Engineering Xiamen University of TechnologyXiamen 361024China State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200241China

Coastal ecosystems are plagued by high levels of microplastic *** baseline surveys is crucial to comprehend the distribution and influencing factors of this *** present study investigates the spatiotemporal variation and diversity of microplastic on the coastal beaches in Xiamen City,China,considering the combined effects of seasons,human activities,and physicochemical properties of *** is detected that the abundance of microplastics in Xiamen beaches was 0.271±0.01 items/*** abundance of microplastics in dry season was significantly higher than in rainy *** terms of spatial variation,the beaches that attracted a larger number of tourists exhibited significantly higher microplastic *** temporal pattern of microplastic distribution on different beaches varied greatly due to region-specific human activities(e.g.,mangrove restoration project)and sedimentary properties(e.g.,bulk density).When the assemblage of microplastics in the coastal area was viewed as a biological community,the Shannon-Wiener index and Pielou's index were higher in rainy season and in the beaches with high intensity of tourist activities,which suggests that the human activities and the surface runoff may contribute to the diversity of microplastics on coastal *** investigations are encouraged to combine controlled experiments and long-term monitoring at multiple scales to elucidate the underlying mechanisms and factors associated with microplastic pollution in coastal zone.

关键词： microplastic pollution coastal beaches spatiotemporal variation diversity

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Experimental study on the accumulative effect of multiple pulses on acceleration sensor

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Defence technology（防务技术） 2022年第5期18卷 772-780页

作者： Jie Shen Yong He Xu-chao Pan Zhong Fang Hong Chen Wan-li Zhang Yun-lei Shi School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China China Electronic Produce Reliability and Environmental Testing Research Institute Guangzhou510610China

Intentional electromagnetic interference is a serious threat to the safety of electronic devices. Multiple electromagnetic pulses will be coupled and transmitted to electronic devices through the *** effects are generated, which make it easier for damage to occur in the electronic devices. In this article, the working principle of micro-silicon acceleration sensors is introduced. The accumulative effects of multiple pulses on acceleration sensors is studied by a large number of injection *** accumulation trends of multiple pulses with different pulse numbers and intervals are analyzed. The damaged structures inside abnormal sensor amplifiers were observed via optical microscopy and scanning electron microscopy. The experimental results show that the accumulative effect is strengthened with increased pulse number or decreased pulse interval, and the threshold voltage for multiple pulses on the acceleration sensor decreases. The threshold voltage for a single pulse is 321.57 V. When the pulse interval is 1 μs and the pulse number is 5, the threshold voltage for multiple pulses is 163.42 V,which is reduced by 49.12% compared with a single pulse. These results provide a reference for the damage design of electromagnetic pulse weapons.

关键词： Accumulative effect Multiple pulses Injection experiment Acceleration sensor Threshold voltage

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Analysis and Zonation of Freeze–Thaw Action in the Chinese Plateau Region Considering Spatiotemporal Climate Characteristics

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engineering 2024年第11期42卷 308-325页

作者： Tiejun Liu Ming Zhang Dujian Zou Jiaping Liu Jinping Ou School of Civil and Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Guangdong Provincial Key Laboratory of Intelligent and Resilient Structures for Civil Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Southeast UniversityNanjing 211189China

Concerns about the durability of transportation infrastructure due to freeze-thaw(F-T)cycles are particu-larly significant in the Chinese plateau region,where concrete aging and performance deterioration pose substantial *** current national standards for the frost resistance design of concrete struc-tures are based predominantly on the coldest monthly average temperature and do not adequately address the comprehensive effects of the spatiotemporal variance,amplitude,and frequency of F-T *** address this issue,this study introduced a spatiotemporal distribution model to analyze the long-term impact of F-T action on concrete structures by employing statistical analysis and spatial inter-polation *** analysis was applied to create a nationwide zonation of F-T action level from data on the freezing temperature,temperature difference,and the number of F-T ***,this study explored the similarity between natural environmental conditions and laboratory-accelerated tests using hydraulic pressure and cumulative damage theories.A visualization platform that incorporates tools for meteorological data queries,environmental characteristic analyses,and F-T action similarity calculations was *** research lays theoretical groundwork and provides technical guidance for assessing service life and enhancing the quantitative durability design of concrete structures in the Chinese plateau region.

关键词： Concrete durability Freeze-thaw(F-T) environmental characteristics Similarity Zonation

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reliability Modelling Method Based on The Stepwise Refined Performance Surrogate Model 14

Reliability Modelling Method Based on The Stepwise Refined P...

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14th IEEE Global reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Liu, Haoran Zhang, Qingyuan Li, Xiaoyang Yu, Li Yuan, Jing Kang, Rui School of Reliability and System Engineering Beihang University Beijing100191 China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing100191 China Zhongfa Aviation Institute of Beihang University Hangzhou311115 China Shenzhen Weimin Institute of Reliability Systems Engineering Shenzhen518100 China

ISBN: (纸本)9798350301359

reliability modelling based on product performance is a hot issue in recent years. Since the relationships between performance and numerous influencing factors are greatly terribly complex, surrogate model with experimental designs has received wide attention. However, due to the limitations of experimental capabilities and conditions, it is difficult to control and measure all the variables in a set of experiments. Hence, it is often difficult to balance the generality, significance and accuracy in one single model. To overcome these issues, in this paper, a stepwise refined performance surrogate model (SRPSM) is proposed. Further, by introducing the concept of performance margin in belief reliability theory, a novel reliability modeling method based on SRPSM is developed. To illustrate the proposed method, the reliability model building process of a new electrical connector product is shown as an example. © 2023 IEEE.

关键词： belief reliability theory degradation performance reliability modelling stepwise refined surrogate model

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Resource utilization of typical biomass wastes as biochars in removing plasticizer diethyl phthalate from water: characterization and adsorption mechanisms

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Frontiers of environmental science & engineering 2023年第1期17卷 49-61页

作者： Mei Shi Xiao Wang Mengying Shao Lun Lu Habib Ullah Hao Zheng Fengmin Li Institute of Coastal Environmental Pollution Control College of Environmental Science and EngineeringKey Laboratory of Marine Environment and Ecology(Ministry of Education)Ocean University of ChinaQingdao 266100China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Department of Environmental Science Zhejiang UniversityHangzhou 310058China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China

Plastic pollution as a global environmental issue has become a research hotspot,among which the removal of inherent plasticizer(e.g.,phthalic acid esters,PAEs)received increasing ***,the effects of biochars derived from different feedstocks on the adsorption of PAEs are poorly ***,the characteristics of biochars derived from six largely produced biomass wastes in China at 400°C,as well as their performance in adsorption of diethyl phthalate(DEP),one of frequently detected PAEs in aqueous environment,were *** results indicated that the variation in feedstock type showed significant changes in the properties(e.g.,porosity,specific surface area,surface functional groups)of biochars,which affected DEP adsorption and *** order and Freundlich models fitted the adsorption data well,and adsorption mechanisms mainly included hydrophobic effect,followed by micropore filling,hydrogen bonding,andπ-πEDA *** thermodynamics revealed that the adsorption was a spontaneous and exothermic the adsorption capacities of DEP on these biochars slightly decreased with the increasing pH but increased with the increasing ionic *** these biochars,the giant reed biochar with relatively higher DEP adsorption and low desorption exhibited the great efficiency for DEP removal as an environment-friendly *** results highlighted the significant roles of micropore filling and hydrogen bond in determining adsorption capacity of designed biochars prepared from selecting suitable agricultural straws and wetland plant waste to typical *** findings are useful for producing designed biochars from different biomass wastes for plasticizer pollution control.

关键词： Plastic pollution Phthalic acid esters Designed biochar Wetland plant Adsorption

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Tailoring fluorine-rich solid electrolyte interphase to boost high efficiency and long cycling stability of lithium metal batteries

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science China Chemistry 2023年第7期66卷 2121-2129页

作者： Tianyang Xue Ji Qian Xingming Guo Yi Chen Kaixin Yu Tianyang Yu Yao Li Li Li Feng Wu Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Advanced Technology Beijing Institute of TechnologyJinan 250300China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Lithium metal batteries(LMBs)are regarded as the most promising next-generation battery system due to their high energy ***,Li dendrite growth and low Coulombic efficiency(CE)of Li metal anodes limit their *** solid electrolyte interphase(SEI)is an extremely effective method to solve these problems and using electrolyte additives to regulate the SEI is one of the most effective ***,we study the feasibility of trans-difluoroethylene carbonate(DFEC)used as the solvent additive in conventional ether electrolyte,which has excellent anti-reduction stability against Li *** result shows that a Li/Cu half-cell with the modified electrolyte can be steadily cycled for 300 cycles with an average CE of 97.41%at the current density of 0.5 m A cm^(-2)and with 97.1%for 140 cycles at 1 m A cm^(-2).Besides,the Li/LFP full cell with the modified electrolyte displays an improved capacity retention of 94.55%after 520 cycles with an average CE of 99.74%at 1 *** contrast,the capacity retention of 56.2%and CE of 99.15%is obtained for the cell with pure ether *** SEM images show that the DFEC enables dense Li deposition,and the FTIR and XPS spectra confirm the formation of Li Frich SEI with the *** work demonstrates the feasibility of using DFEC as the solvent additive in ether electrolyte to construct Li F-rich SEI,and it will provide important insight in developing high-performance electrolytes for LMBs.

关键词： lithium metal batteries ether electrolyte trans-difluoroethylene carbonate LiF-rich SEI dense Li deposition

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Rational design of Ce-doped CdS/N-rGO photocatalyst enhanced interfacial charges transfer for high effective degradation of tetracycline

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Journal of Materials science & technology 2024年第6期173卷 137-148页

作者： Huijie Wang Yang Wan Binrong Li Jian Ye Jiahao Gan Jiejing Liu Xin Liu Xianghai Song Weiqiang Zhou Xin Li Pengwei Huo Institute of Green Chemistry and Chemical Technology School of Chemistry&Chemical EngineeringJiangsu UniversityZhenjiang 212013China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China

The charge carrier separation efficiency and the adsorption capacity of the photocatalyst usually affect the degradation rate of ***,Cerium-doped leaf-like CdS(Ce-CdS)modified with ultrathin N-doped rGO(N-rGO)composites were successfully constructed(Ce-CdS/N-rGO)to investigate the removal efficiency of tetracycline(TC).X-ray photoelectron spectroscopy(XPS)and photoelectrochemical results revealed that Ce ions doped in CdS acting as the electron capture sites facilitated the interfacial charge *** calculation(DFT)results indicated that the interfacial effect between Ce-CdS and ultrathin N-rGO promoted the transfer of photogenerated electrons under the synergistic effect between the doping and interface modification *** optimized Ce5-CdS/N-rGO20 composites had the maximum TC removal capability(94.5%)and maintained a stable cycling *** addition,the adsorption-driven photocatalytic degradation pathway of TC was studied through mass spectrometry(MS)and in-situ Fourier transform infrared spectroscopy(in-situ FTIR).This study will provide an effective strategy for the construction of efficient photocatalytic composites for wastewater treatment.

关键词： Interfacial charges transfer Adsorption-driven photocatalytic degradation Synergistic effect Doping strategy Leaf-like CdS

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