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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao meng qingbin meng Hongwen Jing Bo meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

Preparation and applications of calcium ferrite as a functional material:A review

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 292-310页

作者： Xiuli Han Bowen Duan lei Liu Shilong Fang Weiwei Wang College of Mining Engineering North China University of Science and TechnologyTangshan 063210China Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources of Hebei Province Tangshan 063210China Key Laboratory of Mining Development and Security Technology of Hebei Province Tangshan 063210China

Calcium ferrite(CF)is recognized as a potential green and efficient functional material because of its advantages of magnetism,electrochemistry,catalysis,and biocompatibility in the fields of materials chemistry,environmental engineering,and ***-fore,the obtained research results need to be systematically summarized,and new perspectives on CF and its composite materials need to be *** on the presented studies of CF and its composite materials,the types and structures of the crystal are *** addition,the current application technologies and theoretical mechanisms with various properties in different fields are ***,the various preparation methods of CF and its composite materials are elaborated in *** importantly,the advantages and disadvantages of the synthesis methods of CF and its composite materials are discussed,and the existing problems and emerging challenges in practical production are ***,the key future research directions of CF and its composite materials have been prospected from the potential application technologies to provide references for its synthesis and efficient utilization.

关键词： calcium ferrite mineral functional materials preparation application perspectives

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高铁酸钾对微囊藻毒素的去除效果探讨

水生态学杂志 2009年第5期2卷 111-114页

作者：雷庆铎孟春芳申明召华北水利水电学院环境工程实验中心河南郑州450008

研究高铁酸钾对微囊藻毒素(MC-LR)的去除效果,探讨不同反应影响因素(反应时间、K2FeO4质量浓度、温度和pH)对去除率的影响。结果表明,K2FeO4能够有效地去除水中的MC-LR。K2FeO4对MC-LR的去除率与K2FeO4投加质量浓度、反应时间成正相关,... 详细信息

研究高铁酸钾对微囊藻毒素(MC-LR)的去除效果,探讨不同反应影响因素(反应时间、K2FeO4质量浓度、温度和pH)对去除率的影响。结果表明,K2FeO4能够有效地去除水中的MC-LR。K2FeO4对MC-LR的去除率与K2FeO4投加质量浓度、反应时间成正相关,其中K2FeO4质量浓度对去除效果的影响较为明显;反应温度对去除率的影响不显著;pH对去除率也有重要影响,当pH分别为2和10时去除率分别为94.51%和87.96%。正交试验的结果也进一步证明了不同反应影响因素对去除效果的影响显著程度。

关键词：高铁酸钾微囊藻毒素去除率

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基于图像处理技术的棚室番茄果实识别

农机化研究 2025年第1期47卷 189-193页

作者：陈翠琴孟清成都信息工程大学成都610225 海南职业技术学院工业与信息学院海口570216

我国番茄的产量居世界前列,种植的主要方式为棚室种植,大多采用人工采摘,成本高、效率低,不利于种植产业的发展。为此,提出了一种基于A-ENet模型的图像处理技术,用于棚室番茄果实的识别。A-ENet模型在EfficientNet运行时引入注意力机制... 详细信息

我国番茄的产量居世界前列,种植的主要方式为棚室种植,大多采用人工采摘,成本高、效率低,不利于种植产业的发展。为此,提出了一种基于A-ENet模型的图像处理技术,用于棚室番茄果实的识别。A-ENet模型在EfficientNet运行时引入注意力机制,用于优化深度网络运算结果。EfficientNet通过调整、完善网络的宽度、深度等网络参数提升网络的识别准确率,同时在网络提取输入信号特征时引入注意力机制用于捕捉输入信号特征的权重信息,主动忽略环境因素对目标信号的干扰。A-ENet模型能够解决由于识别目标之间的细微差异产生的识别错误的问题,且能够减少随机环境因素对识别过程的干扰,提高识别成功率,对棚室番茄果实识别问题起到积极的影响作用。实验结果表明:所提出的基于图像处理技术的A-ENet模型能够构建出效率更高、鲁棒性更强的目标识别系统。

关键词：番茄果实 EfficientNet 注意力机制图像处理技术深度网络

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基于课程理解的对话教研:破解课改困境的一个新视角

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北京教育学院学报 2025年第1期39卷 62-66页

作者：孟青北京市朝阳区教育科学研究院小学教育研究部北京100021

教研制度在中国基础教育课程改革中发挥了不可替代的作用。面对新时代的挑战,基于课程理解理论提出对话教研,即要突破教研主体局限,从单一到多元;突破教研目标局限,从忠实执行到理解创生;突破教研方式局限,从单向传递到对话共生,从而破... 详细信息

教研制度在中国基础教育课程改革中发挥了不可替代的作用。面对新时代的挑战,基于课程理解理论提出对话教研,即要突破教研主体局限,从单一到多元;突破教研目标局限,从忠实执行到理解创生;突破教研方式局限,从单向传递到对话共生,从而破解当前课程改革的困境,推进课程改革落地。

关键词：课程理解教研制度对话教研

The autophagy-lysosome pathway:a potential target in the chemical and gene therapeutic strategies for Parkinson’s disease

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Neural Regeneration Research 2025年第1期20卷 139-158页

作者： Fengjuan Jiao Lingyan meng Kang Du Xuezhi Li School of Mental Health Jining Medical UniversityJiningShandong ProvinceChina Shandong Collaborative Innovation Center for Diagnosis Treatment and Behavioral Interventions of Mental DisordersInstitute of Mental HealthJining Medical UniversityJiningShandong ProvinceChina

Parkinson’s disease is a common neurodegenerative disease with movement disorders associated with the intracytoplasmic deposition of aggregate proteins such asα-synuclein in *** one of the major intracellular degradation pathways,the autophagy-lysosome pathway plays an important role in eliminating these *** evidence has shown that upregulation of the autophagy-lysosome pathway may contribute to the clearance ofα-synuclein aggregates and protect against degeneration of dopaminergic neurons in Parkinson’s ***,multiple genes associated with the pathogenesis of Parkinson’s disease are intimately linked to alterations in the autophagy-lysosome ***,this pathway appears to be a promising therapeutic target for treatment of Parkinson’s *** this review,we briefly introduce the machinery of ***,we provide a description of the effects of Parkinson’s disease–related genes on the autophagy-lysosome ***,we highlight the potential chemical and genetic therapeutic strategies targeting the autophagy–lysosome pathway and their applications in Parkinson’s disease.

关键词： autophagy chemical therapy gene therapy Parkinson’s disease α-synuclein

Preparation and scratch test of AlMgB_(14) modified by TiB_2

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Rare Metals 2015年第2期34卷 101-106页

作者： lei Zhuang Yang Miao Wen Liu qing-Sen meng College of Materials Science and Engineering Taiyuan University of Technology College of Mechanical and Electrical Engineering Qingdao Binhai University Institute of Chemical and Biological Technology Taiyuan University of Science and Technology

In this paper, the Al Mg B14 and Al Mg B14–Ti B2 composites were synthesized by means of mechanical alloying and the field-activated and pressure-assisted synthesis process. The effect of temperature and pressure on the purity and property of products was discussed. The results show that the process of preparing Al Mg B14 bulk materials is optimized as follows： synthesis temperature1,400–1,500 ℃, heating rate 100 ℃ min^-1, axial pressure60 MPa, heat preservation 8–10 min, optimum starting powders＇ ratio Al： Mg： B = 0.1915：0.1363：0.6722, and adding excessive 3 wt% Al. The abrasion resistance of Al Mg B14 composites with varying amounts of Ti B2 was studied using single-point diamond scratch tests with loads ranging from 10 to 100 N in 10 N increments. The scratch width increases almost linearly with the applied load and decreases with Ti B2 proportion increasing up to 70 wt%.With its advantages of fast heating, short reaction time,energy conservation, and high purity, this method offers a new way to synthesize Al Mg B14 and Al Mg B14–Ti B2 composites.

关键词： AIMgB_14 Field-activated and pressure-assisted synthesis Temperature Pressure Property

A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng Yang Song Xie Zi-meng Han Hao-Cheng Liu Chong-Han Yin Wen-Bin Sun Zhang-Chi Ling Huai-Bin Yang De-Han Li qing-Fang Guan Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

A Novel Model for Describing Rail Weld Irregularities and Predicting Wheel-Rail Forces Using a Machine Learning Approach

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 555-577页

作者： Linlin Sun Zihui Wang Shukun Cui Ziquan Yan Weiping Hu qingchun meng State Key Laboratory of High-Speed Railway Track System China Academy of Railway Sciences Corporation LimitedBeijing100081China Railway Engineering Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China School of Aeronautic Science and Engineering Beihang UniversityBeijing100191China

Rail weld irregularities are one of the primary excitation sources for vehicle-track interaction dynamics in modern high-speed *** can cause significant wheel-rail dynamic interactions,leading to wheel-rail noise,component damage,and *** researchers have employed the vehicle-track interaction dynamic model to study the dynamic interactions between wheel and rail induced by rail weld geometry ***,the cosine wave model used to simulate rail weld irregularities mainly focuses on the maximum value and neglects the geometric *** this study,novel theoretical models were developed for three categories of rail weld irregularities,based on measurements of the high-speed railway from Beijing to *** vertical dynamic forces in the time and frequency domains were compared under different running *** forces generated by the rail weld irregularities that were measured and modeled,respectively,were compared to validate the accuracy of the proposed ***,based on the numerical study,the impact force due to rail weld irrregularity is modeled using an Artificial Neural Network(ANN),and the optimum combination of parameters for this model is *** results showed that the proposed model provided a more accurate wheel/rail dynamic evaluation caused by rail weld irregularities than that established in the *** ANN model used in this paper can effectively predict the impact force due to rail weld irrregularity while reducing the computation time.

关键词： Rail weld irregularity high-speed railway vehicle-track coupled dynamics wheel/rail dynamic vertical force artificial neural networks