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Morphological evolution and flow conduction characteristics of fracture channels in fractured sandstone under cyclic loading and unloading

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International Journal of Mining Science and Technology 2023年第12期33卷 1527-1540页

作者： Quanle Zou Zihan Chen Jinfei Zhan Chunmei Chen Shikang Gao fanjie kong Xiaofeng Xia State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China School of Mining Guizhou UniversityGuiyang 550025China

In coal mining,rock strata are fractured under cyclic loading and unloading to form fracture *** channels are the main flow narrows for ***,expounding the flow conductivity of fracture channels in rocks on fluids is significant for gas flow in rock *** this regard,graded incremental cyclic loading and unloading experiments were conducted on sandstones with different initial stress ***,the three-dimensional models for fracture channels in sandstones were ***,the fracture channel percentages were used to reflect the flow conductivity of fracture *** study revealed how the particle size distribution of fractured sandstone affects the formation and expansion of fracture *** was found that a smaller proportion of large blocks and a higher proportion of small blocks after sandstone fails contribute more to the formation of fracture *** proportion of fracture channels in fractured rock can indicate the flow conductivity of those *** the proportion of fracture channels varies gently,fluids flow evenly through those ***,if the proportion of fracture channels varies significantly,it can greatly affect the flow rate of *** research results contribute to revealing the morphological evolution and flow conductivity of fracture channels in sandstone and then provide a theoretical basis for clarifying the gas flow pattern in the rock strata of coal mines.

关键词： CT imaging Flow conductivity Three-dimensional reconstruction Proportion of fracture channels Cyclic loading and unloading

Evaluation and intelligent deployment of coal and coalbed methane coupling coordinated exploitation based on Bayesian network and cuckoo search

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International Journal of Mining Science and Technology 2022年第6期32卷 1315-1328页

作者： Quanle Zou Zihan Chen Zhiheng Cheng Yunpei Liang Wenjie Xu Peiran Wen Bichuan Zhang Han Liu fanjie kong State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China North China Institute of Science and Technology Beijing 100083China Key Laboratory of Mine Disaster Prevention and Control in Hebei Province Langfang 065000China

Coal and coalbed methane(CBM)coordinated exploitation is a key technology for the safe exploitation of both ***,existing studies lack the quantification and evaluation of the degree of coordination between coal mining and coalbed methane *** this study,the concept of coal and coalbed methane coupling coordinated exploitation was proposed,and the corresponding evaluation model was established using the Bayesian *** this basis,the objective function of coal and coalbed methane coordinated exploitation deployment was established,and the optimal deployment was determined through a cuckoo *** results show that clarifying the coupling coordinated level of coal and coalbed methane resource exploitation in coal mines is conducive to adjusting the deployment plan in *** case study results show that the evaluation and intelligent deployment method proposed in this paper can effectively evaluate the coupling coordinated level of coal and coalbed methane resource exploitation and intelligently optimize the deployment of coal mine *** optimization results demonstrate that the safe and efficient exploitation of coal and CBM resources is promoted,and coal mining and coalbed methane extraction processes show greater *** observations and findings of this study provide a critical reference for coal mine resource exploitation in the future.

关键词： Coal and coalbed methane Coupling coordinated exploitation Bayesian network Cuckoo search Intelligent optimization

基于生态地理多要素综合分析的我国陆域生态地理区划优化与应用研究

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自然资源情报 2024年第3期 43-49页

作者：孔凡婕王芳葛全胜李炳元梁梦茵自然资源部国土整治中心北京100035 中国科学院地理科学与资源研究所北京100101 自然资源部土地整治重点实验室北京100035

作为自然地域分区的一种类型,生态地理区划兼有理论性与实践性,在揭示生态地理要素特征及其相互作用过程的地域分异规律的同时,可为制定差异化的空间治理措施提供科学依据。随着我国生态文明建设的不断推进,探索生态地理区划方案及其应... 详细信息

作为自然地域分区的一种类型,生态地理区划兼有理论性与实践性,在揭示生态地理要素特征及其相互作用过程的地域分异规律的同时,可为制定差异化的空间治理措施提供科学依据。随着我国生态文明建设的不断推进,探索生态地理区划方案及其应用对美丽中国建设具有重要意义。本文在梳理总结我国生态地理区划研究进展的基础上,立足自然地理格局,构建生态地理区域系统划分的方法和指标体系,提出我国生态地理区划优化方案,从指导因地制宜开展生态保护修复、支撑陆地生态状况监测评价预警、引导优化山水林田湖草沙一体化保护和修复工程布局、为陆地生态系统碳源汇格局研究提供支撑等方面分析区划应用的前景,为应用生态地理区划开展美丽中国建设提供借鉴。

关键词：生态地理区划美丽中国国土空间生态保护修复

Consecutive hybrid mechanism boosting Na+storage performance of dual-confined SnSe2 in N,Se-doping double-walled hollow carbon spheres

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Journal of Energy Chemistry 2022年第11期31卷 8-17,I0002页

作者： Xiaoyu Wu Zhenshan Yang Lin Xu JianHua Wang Lele Fan fanjie kong Qiaofang Shi Yuanzhe Piao Guowang Diao Ming Chen School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina Key Laboratory for Advanced Technology in Environmental Protection of jiangsu Province Yancheng Institute of TechnologyYancheng 224051JiangsuChina Department of Physics Yancheng Institute of TechnologyYancheng 224051JiangsuChina Graduate School of Convergence Science and Technology Seoul National University145 Gwanggyo-roYeongtong-guSuwon-si 16229Gyeonggi-doRepublic of Korea Advanced Institutes of Convergence Technology 145 Gwanggyo-roYeongtong-guSuwon-siGyeonggi-do16229Republic of Korea

Rationally designed hierarchical structures and heteroatomic doping of carbon are effective strategies to enhance the stability and electrical conductivity of ***,SnSe_(2)flakes were generated in the double-walled hollow carbon spheres(DWHCSs),in which N and Se atoms were doped in the carbon walls,to construct SnSe_(2)@N,Se-DWHCSs by confined growth and in-situ *** N and Sedoped DWHCSs can effectively limit the size increase of SnSe_(2),promote ion diffusion kinetics,and buffer volume expansion,which can be proved by electron microscope observation and density functional theory ***,the SnSe_(2)@N,Se-DWHCSs as an anode material for sodium ion batteries(SIBs)demonstrated a distinguished reversible capacity of 322.8 mAh g^(-1)at 5 A g^(-1)after 1000 cycles and a superior rate ability of 235.3 m Ah g^(-1)at an ultrahigh rate of 15 A g^(-1).Furthermore,the structure evolution and electrochemical reaction processes of SnSe2@N,Se-DWHCSs in SIBs were analyzed by exsitu methods,which confirmed the consecutive hybrid mechanism and the phase transition process.

关键词： SnSe2 N,Se-doping Double-walled hollow carbon spheres Hybrid mechanism Sodium-ion battery

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止脱弹簧的蠕变行为与贮存寿命预测

国防科技大学学报 2017年第5期39卷 74-79页

作者：孔繁杰崔辉如刘夏杨闫路季宝锋北京宇航系统工程研究所北京100076 国防科技大学空天科学学院湖南长沙410073

根据止脱弹簧的受力模式和失效机理,设计了止脱弹簧的蠕变老化试验装置,对止脱弹簧进行了蠕变加速老化试验,利用图像测量技术研究了载荷和温度对止脱弹簧自由端蠕变行为的影响规律。进一步,基于Arrhenius方程建立了止脱弹簧在力-热联合... 详细信息

根据止脱弹簧的受力模式和失效机理,设计了止脱弹簧的蠕变老化试验装置,对止脱弹簧进行了蠕变加速老化试验,利用图像测量技术研究了载荷和温度对止脱弹簧自由端蠕变行为的影响规律。进一步,基于Arrhenius方程建立了止脱弹簧在力-热联合载荷下的蠕变动力学方程,预测了止脱弹簧的使用寿命。研究表明:止脱弹簧的蠕变位移是一个随时间变化的单调非减函数;环境温度和载荷水平的提高都会加速止脱弹簧的蠕变。所提方法和相关结论可为蠕变型止脱弹簧的设计和寿命预测提供参考。

关键词：止脱弹簧蠕变 Arrhemu方程寿命预测

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紧固孔原始疲劳质量控制与制孔技术研究

机械强度 2000年第3期22卷 214-216,230页

作者：董登科王俊扬孔繁杰飞机强度研究所西安710065 山东省工业学校淄博255070

对飞机结构耐久性和安全性有重要影响的紧固孔原始疲劳质量进行了分析，建立了制孔技术与紧固孔原始疲劳质量的内在联系。提出用满足双９５％要求的当量初始裂纹尺寸ａ；值来定量描述紧固孔原始疲劳质量。给出通过紧固孔原始疲劳质量评... 详细信息

对飞机结构耐久性和安全性有重要影响的紧固孔原始疲劳质量进行了分析，建立了制孔技术与紧固孔原始疲劳质量的内在联系。提出用满足双９５％要求的当量初始裂纹尺寸ａ；值来定量描述紧固孔原始疲劳质量。给出通过紧固孔原始疲劳质量评定和符合性检查来选择或验证制孔技术的方法。

关键词：紧固孔原始疲劳质量控制制孔技术飞机

NEMO网络在PMIPv6中的实现及快速切换方案

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计算机应用 2013年第6期33卷 1495-1499,1504页

作者：孔繁杰张奇支饶亮陈源华南师范大学计算机学院广州510631

针对网络移动性(NEMO)基本支持方案(NBS)中NEMO网络切换时延过长的问题,提出一种NEMO网络在代理移动IPv6(PMIPv6)中的实现方案,并针对其切换流程进行了进一步优化。新方案通过缩减经无线链路传输的切换信令条数以及提前建立数据转发隧道... 详细信息

针对网络移动性(NEMO)基本支持方案(NBS)中NEMO网络切换时延过长的问题,提出一种NEMO网络在代理移动IPv6(PMIPv6)中的实现方案,并针对其切换流程进行了进一步优化。新方案通过缩减经无线链路传输的切换信令条数以及提前建立数据转发隧道,实现了移动网络的快速切换。分析结果显示,新方案的标准切换流程和快速切换流程比NBS方案的切换流程分别减少了56.55%和58.63%的切换时延。

关键词：网络移动性代理移动IPv6 快速切换