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Novel rockburst prediction criterion with enhanced explainability employing CatBoost and nature-inspired metaheuristic technique

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Underground Space 2024年第6期19卷 101-118页

作者： Yingui Qiu Jian Zhou School of Resources and Safety Engineering Central South UniversityChangsha 410083China

Rockburst is a major challenge to hard rock engineering at great *** and timely assessment of rockburst risk can avoid unnecessary casualties and property *** the existence of various methods for rockburst assessment,there remains an urgent need for a comprehensive and reliable criterion that is easy to both apply and *** a new rockburst criterion based on simple parameters can potentially fill this *** its advantages,this criterion can facilitate a more effective and efficient prediction of rockburst potential,thereby contributing significantly to enhancing safety *** this paper,combined with the internal and external factors of rockburst,four control variables(i.e.,integrity index,stress index,brittleness index,and elastic energy index)were selected to be incorporated into a comprehensive rockburstability index(RBSI).Based on 116 sets of rockburst cases,the rockburst potential was accurately quantified and predicted using the categorical boosting(CatBoost)model and the nature-inspired metaheuristic African vultures optimization algorithm(AVOA).In its performance validation,the criterion achieved the highest accuracy of 90.48%,verifying the reliability and effectiveness of the proposed RBSI ***,an interpretive method was applied to analyze the variable influence on the criterion,facilitating the explanation of predictions and the analysis of the formula’s robustness under different *** general,compared with existing criterion methods involving relevant indicators,the newly proposed RBSI criterion enhances the accuracy of rockburst potential prediction,and it can effectively and swiftly evaluate the preliminary risk of ***,a graphical user interface was developed to provide a clear visualization of the assessment of rockburst potential.

关键词： Rockburst criterion CatBoost Metaheuristic optimization Model interpretation Graphical user interface

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Thermodynamics-directed bulk/grain-boundary engineering for superior electrochemical durability of Ni-rich cathode

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Journal of Energy Chemistry 2024年第10期97卷 321-331,I0006页

作者： Kangyu Zou Mingzhu jiang Tianxiang Ning Lei Tan Junchao Zheng Jiexi Wang Xiaobo Ji Lingjun Li School of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114HunanChina Cllege of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina National Engineering Research Centre of Advanced Energy Storage Materials Changsha 410205HunanChina

Introducing high-valence Ta element is an essential strategy for addressing the structu ral deterioration of the Ni-rich LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)cathode,but the enlarged Li/Ni cation mixing leads to the inferior rate capability originating from the hindered Li~+*** that the non-magnetic Ti~(4+)ion can suppress Li/Ni disorder by removing the magnetic frustration in the transition metal ***,it is still challenging to directionally design expected Ta/Ti dual-modification,resulting from the complexity of the elemental distribution and the uncertainty of in-situ formed coating compounds by introducing foreign ***,a LiTaO_3 grain boundary(GB)coating and bulk Ti-doping have been successfully achieved in LiNi_(0.834)Co_(0.11)Mn_(0.056)O_(2) cathode by thermodynamic guidance,in which the structural formation energy and interfacial binding energy are employed to predict the elemental diffusion discrepancy and thermodynamically stable coating *** to the coupling effect of strengthened structural/interfacial stability and improved Li~+diffusion kinetics by simultaneous bulk/GB engineering,the Ta/Ti-NCM cathode exhibits outstanding capacity retention,reaching 91.1%after 400 cycles at 1 *** elaborate work contributes valuable insights into rational dual-modification engineering from a thermodynamic perspective for maximizing the electrochemical performances of NCM cathodes.

关键词： Ni-rich layered cathode Dual-modification Grain boundary coating Bulk doping Thermodynamic perspective

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Interface engineering strategy via electron-defect trimethyl borate additive toward 4.7 V ultrahigh-nickel LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)battery

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Journal of Energy Chemistry 2024年第5期92卷 639-647页

作者： Yilin Zhang Yuqing Chen Qiu He Jinlong Ke Wei Wang Jian-Fang Wu Peng Gao Yanhua Li Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina School of Materials Science and Engineering Hunan Institute of TechnologyHengyang 421002HunanChina

The Li metal battery with ultrahigh-nickel cathode(LiNi_(x)M_(1-x)O_(2),M=Mn,Co,and x≥0.9)under high-voltage is regarded as one of the most promising approaches to fulfill the ambitious target of 400 Wh/***,the practical application is impeded by the instability of electrode/electrolyte interface and Ni-rich cathode *** we proposed an electron-defect electrolyte additive trimethyl borate(TMB)which is paired with the commercial carbonate electrolyte to construct highly conductive fluorine-and boron-rich cathode electrolyte interface(CEI)on LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)(NCM90)surface and solid electrolyte interphase(SEI)on lithium metal *** modified CEI effectively mitigates the structural transformation from layered to disordered rock-salt phase,and consequently alleviate the dissolution of transition metal ions(TMs)and its“cross-talk”effect,while the enhanced SEI enables stable lithium plating/striping and thus demonstrated good compatibility between electrolyte and lithium metal *** a result,the common electrolyte with 1 wt%TMB enables 4.7 V NCM90/Li cell cycle stably over 100 cycles with 70%capacity *** work highlights the significance of the electron-defect boron compounds for designing desirable interfacial chemistries to achieve high performance NCM90/Li battery under high voltage operation.

关键词： NCM90 batteries Electrolyte additive Trimethyl borate

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Covalency competition induced selective bond breakage and surface reconstruction in manganese cobaltite towards enhanced electrochemical charge storage

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Green Energy & Environment 2024年第5期9卷 909-918页

作者： Peng Gao Pei Tang Ying Mo Peitao Xiao Wang Zhou Shi Chen Hongliang Dong Ziwei Li Chaohe Xu Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangshaHunan410082China department of Materials Science and Engineering National University of Defense TechnologyChangshaHunan410073China Joint Key Laboratory of the Ministry of education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao999078China Center for High Pressure Science and Technology Advanced Research PudongShanghai201203China College of Aerospace Engineering Chongqing UniversityChongqing400044China

Manganese cobaltite(MnCo_(2)_(4))is a promising electrode material because of its attractive redox chemistry and excellent charge storage *** previous work demonstrated that the octahedrally-coordinated Mn are prone to react with the hydroxyl ions in alkaline electrolyte upon electrochemical cycling and separates on the surface of spinel to reconstruct into d-MnO_(2) nanosheets irreversibly,thus results in a change of the reaction mechanism with Kþion ***,the low capacity has greatly limited its practical ***,we found that the tetrahedrally-coordinated Co_(2) þions were leached when MnCo_(2)_(4) was equilibrated in 1 mol L^(-1) HCl solution,leading to the formation of layered CoOOH on MnCo_(2)_(4) surface which is originated from the covalency competition induced selective breakage of the CoT–O bond in CoT–O–CoO and subsequent rearrangement of free Co_(6) *** as-formed CoOOH is stable upon cycling in alkaline electrolyte,exhibits conversion reaction mechanism with facile proton diffusion and is free of massive structural evolution,thus enables utilization of the bulk electrode material and realizes enhanced speciﬁc capacity as well as facilitated charge transfer and ion *** general,our work not only offers a feasible approach to deliberate modiﬁcation of MnCo_(2)_(4)'s surface structure,but also provides an in-depth understanding of its charge storage mechanism,which enables rational design of the spinel oxides with promising charge storage properties.

关键词： Manganese cobaltite Tetrahedrally-coordinated Co^(2+)leaching Selective bond breakage Surface reconstruction Charge storage mechanisms

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Luteolin promotes neuronogenesis in hippocampus of chronic unpredictable mild stress rats and primary hippocampus of fetal rats

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Journal of Traditional Chinese Medicine 2024年第4期44卷 670-679页

作者： LIU Tongtong ZHANG Xi YANG Hui LIN Xiaoyuan LIU Jian ZHANG Xiuli GUO Dongwei ZHAO Hongqing ZOU Manshu LEI Chang LONG Hongping LUO Yan XIANG Yun GE Jinwen WANG Yuhong MENG Pan Institute of Innovation and Applied Research in Chinese Medicine Hunan University of Chinese MedicineChangsha 410208China the Second People's Hospital of hunan Province Changsha 410007China The First Affiliated Hospital Hunan University of Chinese MedicineChangsha 410007China hunan Academy of Chinese Medicine Changsha 410013China

OBJECTIVE:To investigate the effects of luteolin on chronic unpredictable mild stress(CUMS)-induced depressive rats and corticosterone(CORT)-induced depressive primary hippocampal neurons,and to elucidate the mechanism behind the ***:The antidepressant mechanism of luteolin was studied by using CUMS rat model and primary hippocampal neurons in fetal *** vivo,novelty suppressed feeding,open-field and sucrose preference tests as well as Morris water maze were *** content of brain derived neurotrophic factor(BDNF),5-hydroxytryptamine(5-HT),norepinephrine(NE),and dopamine(DA)in serum were detected by enzyme-linked immunosorbent *** mechanisms of luteolin were explored based on neurotrophin and hippocampal neurogenesis,and *** of the septotemporal axis in hippocampus was assayed using the 5-bromo-2-deoxyuridine(BrdU),the expression of BDNF,neurotrophin-3(NT-3),and nerve growth factor(NGF)in hippocampus dentate gyrus region were measured by *** vitro,BDNF,NT-3,tropomyosin receptor kinase B(TrkB),and phosphorylated cyclic adenosine monophosphate responsive element binding protein(p-CREB)were detected through the high content analysis(HCA)to investigate neurotrophin and ***:Induction of CUMS in rats induced depressive symptoms,while luteolin significantly enhanced sucrose consumption,decreased feeding latency,increased locomotor activity,escape latency,distance of target quadrant and regulated the content of depressive-like *** analysis revealed that luteolin increased the abundance of new born neurons that had been labeled with BrdU,BrdU+neuronal nuclear antigen,and BrdU+doublecortin in septo-temporal axis of S2(mid-septal)and T3(mid-temporal).Moreover,expression of BDNF,NT-3,and NGF increased significantly in the septo-temporal axis of S2 and *** showed increased expression of BDNF,NT-3,TrkB and p-CREB in primary hippocampal ***:The results provided direct ev

关键词： fetal rats Survival

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Utilizing semantic-level computer vision for fracture trace characterization of hard rock pillars in underground space

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Geoscience Frontiers 2024年第2期15卷 366-391页

作者： Chuanqi Li Jian Zhou Daniel Dias Laboratory 3SR CNRS UMR 5521Grenoble Alpes UniversityGrenoble 38000France School of Resources and Safety Engineering Central South UniversityChangsha 410083China

This study utilizes a semantic-level computer vision-based detection to characterize fracture traces of hard rock pillars in underground *** trace images captured by photogrammetry are used to establish the database for training two convolutional neural network(CNN)-based models,i.e.,U-Net(University of Freiburg,Germany)and DeepLabV3+(Google,USA)*** code technology,polyline approximation algorithm,and the circular window scanning approach are combined to quantify the main characteristics of fracture traces on flat and uneven surfaces,including trace length,dip angle,density,and *** extraction results indicate that the CNN-based models have better performances than the edge detection methods-based Canny and Sobel operators for extracting the trace and reducing noise,especially the DeepLabV3+***,the quantization results further prove the reliability of extracting the fracture *** a result,a case study with two types of traces(i.e.,on flat and uneven surfaces)demonstrates that the applied semantic-level computer vision detection is an accurate and efficient approach for characterizing the fracture trace of hard rock pillars.

关键词： Fracture trace Hard rock pillar Semantic-level computer vision Convolutional neural network(CNN) Underground space

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基于BSG深度学习模型的中医药智能问答系统研究:以方剂和中药为例

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Digital Chinese Medicine 2024年第1期7卷 47-55页

作者：李冉任高晏峻峰邹北骥刘青萍湖南中医药大学信息科学与工程学院湖南长沙410208 中南大学计算机学院湖南长沙410083

目的基于深度学习的方法,利用知识图谱构建中医药知识库,探寻联合模型在中医药智能问答系统的应用。方法以《方剂学》和《中药学》规划教材为基础建立知识图谱,作为智能问答系统的知识来源,本研究提出一种BERT+Slot-Gated(BSG)深度学习... 详细信息

目的基于深度学习的方法,利用知识图谱构建中医药知识库,探寻联合模型在中医药智能问答系统的应用。方法以《方剂学》和《中药学》规划教材为基础建立知识图谱,作为智能问答系统的知识来源,本研究提出一种BERT+Slot-Gated(BSG)深度学习模型,获取用户自然问题中包含的中医药实体和问句意图,通过实体和意图在知识图谱检索答案返回给用户,运用Flask框架和BSG模型研发中医药智能问答系统。结果构建了包含3149个实体和6891个关系三元组的中医药知识图谱,通过问题语料测试,本系统在回答中医药20类问题的实体识别F1值为0.9969,意图识别准确率为99.75%,表明本系统具有较高的实用性和可行性,并通过微信公众号平台实现了用户与系统交互。结论本文所提出的BSG模型通过提高向量维度在实验中取得了较好的结果,表明联合模型方法的有效性,可为实现中医药智能问答系统提供新的研究思路。

关键词：中医药深度学习知识图谱智能问答系统 BERT+Slot-Gated模型

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Quercetin,the key constituent of Astragali Radix,modulates ferroptosis in PASMCs and attenuates hypoxia pulmonary hypertension via the MAPK signaling pathway

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Journal of Chinese Pharmaceutical Sciences 2024年第8期33卷 714-729页

作者： Xia Li Beibei Cheng Junlan Tan Jiajing Wan Yuhong Wang Aiguo Dai hunan Academy of Chinese Medicine Changsha 410208HunanChina department of Respiratory Diseases Medical SchoolHunan University of Chinese MedicineChangsha 410208HunanChina hunan Provincial Key Laboratory of Vascular Biology and Translational Medicine Changsha 410208HunanChina Science and Technology Innovation Center Hunan University of Chinese MedicineChangsha 410208HunanChina

This study delved into the mechanism by which the principal component of Astragali Radix regulated ferroptosis in the context of hypoxia-induced pulmonary hypertension,employing a combination of network pharmacology and experimental validation *** constituents of Astragali Radix and their corresponding targets were identified using the TCMSP database,while therapeutic targets associated with hypoxia-induced pulmonary hypertension were sourced from the GeneCards *** Venn online tool facilitated the identification of overlapping targets between the active constituents of Astragali Radix and hypoxia-induced pulmonary *** network diagrams depicting the relationship between Astragali Radix’s active constituents and their targets were constructed using Cytoscape software,with core targets and sub-networks identified using the CytoHubba *** ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway enrichment analyses were conducted using the DAVID ***,the FerrDb database was consulted to analyze genes implicated in regulating *** investigation revealed 18 active constituents selected from Astragali Radix,with quercetin emerging as the key component.A total of 35 potential targets associated with Astragali Radix in regulating ferroptosis and addressing hypoxia-induced pulmonary hypertension were *** validation demonstrated that quercetin could inhibit the MAPK signaling pathway,resulting in reduced Fe2+and lipid peroxide levels,increased GPX4 expression,and the reversal of *** summary,this study elucidated the fundamental constituents and pivotal signaling pathways through which Astragali Radix modulated ferroptosis and mitigated hypoxia-induced pulmonary ***,quercetin,a core constituent of Astragali Radix,was observed to inhibit ferroptosis in pulmonary arterial smooth muscle cells via the MAPK pathway and alleviate hypoxia-induc

关键词： Network pharmacology Astragali Radix Quercetin PASMCs Ferroptosis Hypoxia pulmonary hypertension

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Preparation and Oxidation Resistance of BN-MgAlON Composites by Hot-pressing Sintering

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Journal of Iron and Steel Research International 2015年第5期22卷 423-430页

作者： Ran LIU Xin-yuan ZHANG Xing-juan WANG Ya-na QIE Qing L Fu GAO Key Laboratory for Advanced Metallurgy Technology of Ministry of education Hebei United University College of Metallurgy and Energy Hebei United University

BN-MgA1ON composites were prepared by hot-pressing sintering under nitrogen atmosphere with BN-Mg- A1ON composite powders as raw material and Y2 O3 as sintering additive. Based on thermodynamic analysis, the oxi- dation resistance of BN-MgAION composites was investigated and the dynamics of oxidation process was also ana- lyzed. The oxidation process and the micro-morphology of the samples before and after oxidation were characterized by X-ray diffraction and scanning electron microscopy. The dynamics of oxidation resistance of the BN-MgA1ON composites was investigated via the analysis of the constant temperature oxidation mass gain curves. The results show that the main components of the material are MgA1ON, Sialon, BN and CaYAI3 07 at 1 650--1750 ＊C, and the content of CaYA1307 decreases as the sintering temperature increases. The BN-MgA1ON composites prepared at 1750 ℃ is uniform and compact with the balanced distributions of A1, Mg, O, and N. The oxidation process of BN- MgA1ON composites in air mainly consists of MgAION, Sialon and BN oxidation. The section after being oxidized at 1000--1300 ℃ involves three layers, namely, the outer layer, the middle layer and the inner layer. The oxidation process follows the parabola model. The apparent activation energy of the oxidation process is 2.13 × 10 5 J/mol and the frequency factor is 4.66 × 10 6.

关键词： boron-rich slag carbothermal reduction nitridation hot-pressing sintering BN-MgAION compositeoxidation resistance

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Effects of heat treatment on mechanical properties of an extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr alloy and establishment of its Hall–Petch relation

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Journal of Magnesium and Alloys 2022年第2期10卷 539-551页

作者： Lei Liu Xiaojie Zhou Shilun Yu Jian Zhang Xianzheng Lu Xin Shu Zaijun Su hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment Changsha University of Science and TechnologyChangsha 410114China hunan Xiangtou Goldsky Titanium Metal Co. Ltd.Changsha 410205China hunan Aerospace Tianlu Advanced Material Testing Co. LtdChangsha 410600China School of Mechanical Engineering Hunan University of TechnologyZhuzhou 412007China

The effects of T4,T5,and T6 treatment on the microstructure and mechanical properties of the extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr(wt.%)alloy with a relatively low RE content(7.5 wt.%)were investigated.T4 treatment at 450–500°C induces a gradual grain growth ofα-Mg but an obvious transition of texture component from⊥ED to∥*** LPSO phases are highly stable against annealing while intragranular ones experience dissolution and *** peak-ageing at 200°C,the elongation of as-extruded and T4 samples is just slightly reduced or even increased due to the weak ageing hardening response.T5 sample exhibits an attractive combination of strength and ductility,with a tensile yield strength(TYS)of 303 MPa and elongation of 20.0%.The Hall–Petch relation for the alloys with or without ageing treatment has been *** boundary strengthening rather than precipitation strengthening has the dominant contribution to TYS,and a modified equation is developed to predict grain boundary strengthening values for Mg-Gd-Y-Zn-Zr alloys which contain different Schmid factors for basal slip.

关键词： Magnesium alloys Heat treatment Hall–Petch Mechanical properties Strengthening mechanism

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