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Optimizing profile line interval for enhanced accuracy in rock joint morphology and shear strength assessments

International Journal of Mining Science and Technology 2024年第5期34卷 587-608页

作者： Leibo Song Quan Jiang Shigui Du Jiamin Song Gang wang Yanting Gu xingkai wang Jinzhong Wu School of Civil Engineering Shaoxing UniversityShaoxing 312000China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing 312000China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Institute of Rock Mechanics Ningbo UniversityNingbo 315211China

2D profile lines play a critical role in cost-effectively evaluating rock joint properties and shear ***, the interval(ΔI_(L)) between these lines significantly impacts roughness and shear strength assessments. A detailed study of 45 joint samples using four statistical measures across 500 different ΔI_(L)values identified a clear line interval effect with two stages: stable and *** statistical analysis showed a linear relationship between the error bounds of four parameters,shear strength evaluation, and their corresponding maximum ΔI_(L)values, where the gradient k of this linear relationship was influenced by the basic friction angle and normal stress. Accounting for these factors,lower-limit linear models were employed to determine the optimal ΔI_(L)values that met error tolerances(1%–10%) for all metrics and shear strength. The study also explored the consistent size effect on joints regardless of ΔI_(L)changes, revealing three types of size effects based on morphological ***, larger joints required generally higher ΔI_(L)to maintain the predefined error limits, suggesting an increased interval for large joint analyses. Consequently, this research provides a basis for determining the optimal ΔI_(L), improving accuracy in 2D profile line assessments of joint characteristics.

关键词： Rock joint Roughness Shear strength Size effect Profile line interval effect

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上海软土地层中地铁联络通道冻结法施工的温度场发展特性

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城市轨道交通研究 2024年第1期27卷 80-86页

作者：赵昊楠夏才初王兴开绍兴文理学院土木工程学院绍兴312099 同济大学土木工程学院上海200092

[目的]为了在冻结法施工前预先判断冻结壁的发展情况,验证设计的合理性,从而科学地指导工程施工,需要研究上海地铁联络通道在软土地层中冻结法施工的温度场发展规律,并提出检验指标及经济指标。[方法]以上海轨道交通15号线某区间联络通... 详细信息

[目的]为了在冻结法施工前预先判断冻结壁的发展情况,验证设计的合理性,从而科学地指导工程施工,需要研究上海地铁联络通道在软土地层中冻结法施工的温度场发展规律,并提出检验指标及经济指标。[方法]以上海轨道交通15号线某区间联络通道为背景,对冻结壁厚度、土层温度、盐水温度及冻结过程进行分析,通过ABAQUS有限元软件建立全地层三维数值模型,预测冻结温度场发展特性,并与现场实测温度数据进行验证。[结果及结论]黏土层冻结帷幕平均发展速度为54.535 mm/d,粉质黏土层冻结帷幕平均发展速度为52.450 mm/d,黏土层比粉质黏土层冻结效果好;由于冻结管端头截面冻结效果较弱,以该截面处弱侧冻结壁厚度和平均温度作为冻结效果的检验指标,降低强度破坏可能性;盐水温度对冻结壁厚度发展的影响随温度的降低而减弱,其中-35~-30℃时经济效益最高;模拟结果与实测数据总体降温趋势一致,可较为真实地反映实际工程。

关键词：地铁隧道冻结法数值模拟联络通道瞬态温度场

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A novel motion coordination method for variable-sized multi-mobile robots

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Frontiers of Information Technology & Electronic Engineering 2023年第4期24卷 521-535页

作者： Zichao XING xingkai wang Shuo wang Weimin WU Ruifen HU State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang UniversityHangzhou 310027China

Multi-mobile robot systems(MMRSs)are widely used for transportation in industrial scenes such as manufacturing and *** an MMRS,motion coordination is important as collisions and deadlocks may lead to losses or system ***,in some scenarios,robot sizes are different when loaded and unloaded,which means that the robots are variable-sized,making motion coordination more *** methods based on zone control need to first divide the environment into disjoint zones,and then allocate the zones statically or dynamically for motion *** zone-control-based methods are not accurate enough for variable-sized multi-mobile robots and reduce the efficiency of the *** paper describes a motion coordination method based on glued nodes,which can dynamically avoid collisions and deadlocks according to the roadmap structure and the real-time paths of *** features make this method directly applicable to various scenarios,instead of dividing a roadmap into disjoint *** proposed method has been applied to many industrial projects,and this study is based on some manufacturing projects for *** analysis and experimental results show that the proposed algorithm is effective and efficient.

关键词： Multi-mobile robot system Collision avoidance Deadlock avoidance Glued nodes Motion coordination

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官厅水库库滨带治理措施及效果分析

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北京水务 2024年第S1期 33-37,64页

作者：武少伟刘思岐王星凯北京市水利规划设计研究院北京100048 北京市经济社会发展研究院北京101160 北京市城市河湖管理处北京100144

官厅水库作为北京市战略饮用水源地,在保障首都水资源安全方面具有重要作用。在分析官厅水库库滨带存在问题的基础上,结合水库恢复总体目标,提出库滨带封闭管理、入库支沟污染治理、管理道路等配套设施建设及生态修复等治理措施,构建集... 详细信息

官厅水库作为北京市战略饮用水源地,在保障首都水资源安全方面具有重要作用。在分析官厅水库库滨带存在问题的基础上,结合水库恢复总体目标,提出库滨带封闭管理、入库支沟污染治理、管理道路等配套设施建设及生态修复等治理措施,构建集生态效应、管理效应于一体的官厅水库库滨带水源保护系统,并分析措施实施后能够达到的效果。治理措施的实施对促进官厅水库水源地恢复具有重要作用,为北京市其他水库库滨带治理提供参考。

关键词：官厅水库库滨带治理措施效果分析

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Collision and Deadlock Avoidance in Multi-Robot Systems Based on Glued Nodes

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IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1327-1330页

作者： Zichao Xing Xinyu Chen xingkai wang Weimin Wu Ruifen Hu The authors are with the State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang UniversityHangzhou 310027China IEEE

Dear editor,In this letter,we would like to discuss a method to avoid collisions and deadlocks in multi-robot systems based on a new concept of glued *** terms of collision and deadlock avoidance,many methods are based on zone control which has two ***,unless all nodes are collision-free,the roadmap must be divided into disjoint zones,which increases the difficulty of applying the ***,each zone should be able to accommodate a robot,which leads to imprecision and waste of *** letter proposes the concept of glued nodes,which can dynamically determine the mutual influence between nodes based on the real-time sizes and paths of the *** on the glued nodes,this letter proposes a collision and deadlock avoidance algorithm,which can be applied to multi-robot systems with variable-sized robots and roadmaps with any *** experimental results indicate that the method proposed in this letter is effective and efficient.

关键词： lock collision letter

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Thermal effects on fracture toughness of cracked straight-through Brazilian disk green sandstone and granite

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1447-1460页

作者： Lei Zhou Weiting Gao Liyuan Yu Zheming Zhu Jianxing Chen xingkai wang Key Laboratory of Deep Earth Science and Engineering Ministry of EducationSichuan UniversityChengdu610065China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu610065China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing312000China

Cracked straight-through Brazilian disc(CSTBD) samples prepared using two rock materials were used for thermal treatment from room temperature to 700℃. Uniaxial splitting experiments were performed using an automatic electro-hydraulic servo press to study the evolution laws of physical and fracture properties of different deep rock materials under high-temperature geological conditions. The fracture characteristics were measured using an industrial camera and digital image correlation technology to analyze the effect of high temperature on fracture properties and failure modes of the CSTBD samples after different thermal treatments. The micro-damage properties of green sandstone and granite materials were obtained using a scanning electron microscope(SEM). The following conclusions were drawn from the test results:(1) With the increasing temperature, the fracture characteristics of green sandstone and granite change from brittle fracture to plasticity fracture, the longitudinal wave velocity of granite decreases sharply at 600℃, and the damage factor reaches 0.8748 at 700℃.(2) The fracture toughness of green sandstone and granite decreases with increasing temperature;however, the decreasing range of granite is larger than that of green sandstone.(3) As the temperature increases, the fracture morphologies of green sandstone and granite materials become rougher, whereas thermal damage cracks of granite and intergranular fractures inside sandstone as well as pores of sandstone increase.(4) The crack tip opening displacement and peak strain corresponding to peak load increase with the temperature.

关键词： High temperature Cracked straight-through Brazilian disc(CSTBD)sample Fracture toughnessm Scanning electron microscope(SEM)

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肌肽在头皮护理方面的功效机制研究进展

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山东化工 2024年第1期53卷 113-119页

作者：武涛刘慧庄开颜刘菲王学文王倩王兴凯陈博文张绚杨素珍山东福瑞达生物股份有限公司山东济南250101

目的:基于网络药理学和文献计量学研究肌肽对头皮不适症状的护理功效和机制及其当前的研究进展。方法:通过SwissTarget Prediction平台预测肌肽的潜在作用靶点,基于Genecards数据库和OMIM数据库检索头皮相关不适症状的潜在发病靶点,然... 详细信息

目的:基于网络药理学和文献计量学研究肌肽对头皮不适症状的护理功效和机制及其当前的研究进展。方法:通过SwissTarget Prediction平台预测肌肽的潜在作用靶点,基于Genecards数据库和OMIM数据库检索头皮相关不适症状的潜在发病靶点,然后利用R软件获取肌肽和头皮不适症状的交集靶点,即肌肽对头皮护理的潜在作用靶点,借助STRING平台对交集靶点的蛋白互作可视化呈现,利用Cytoscape软件的网络分析工具筛选出关键靶点。对交集靶点进行GO和KEGG富集分析,剖析肌肽在头皮护理上的潜在功效及其作用机制。通过文献计量学分析了近10年肌肽的研究现状及后期研究趋势。结果:通过网络药理学分析,获取了肌肽与头皮不适相关疾病的交集靶点31个,关键靶点主要有EGFR、ICAM1、NOS3、PPARG、ITGB2、ITGB3和LCK等,生物过程主要有359条,细胞组成主要有33条,分子功能主要有50条,涉及的通路主要有NF-κB信号通路、精氨酸生物合成、NF-κB信号通路、细胞黏附、HIF-1信号通路和JAK-STAT信号通路等。通过文献计量学分析,共纳入531篇文献,年发文量稳定在50篇左右,主要研究领域是医药相关领域,主要专业是神经病学等。结论:肌肽可能通过NF-κB信号通路和JAK-STAT信号通路等多途径发挥保护头皮的功效,当前针对肌肽功效的探索着重于医药领域,在头皮护理方面仍具有较大研究前景。

关键词：肌肽网络药理学头皮不适保护机制文献计量学

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A New Distribution Method for Wet Steam Injection Optimization

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Fluid Dynamics & Materials Processing 2024年第1期20卷 109-126页

作者： Jingjing Gao xingkai Zhang Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering Yangtze UniversityWuhan434000China

A new approach and a new related distribution system are proposed to address the issue of uneven steam injection caused by the different suction capacities of the used wells during the application of steam“stimulation”methods for enhanced oil *** new distribution system consists of a swirler,spiral dividing baffles,and critical flow *** simulations are used to analyze the flow-field and degree of steam homogeneity obtained with such an *** results indicate that a higher inlet pressure leads to better ***,the internal flow field becomes more stable,and the deviation from an even distribution reduces to±4.0%even when the resistance of each branch is ***,field tests have yielded satisfactory results.

关键词： Cyclical steam stimulation homogeneous distribution gas-liquid two-phase flow critical flow nozzle

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桔梗改善皮肤色素沉着的研究

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山东化工 2024年第2期53卷 36-39页

作者：武涛王兴凯刘慧刘菲王学文王倩陈博文庄开颜张绚杨素珍山东福瑞达生物股份有限公司山东济南250101

目的:探究桔梗提取物对皮肤色素沉着的功效及其作用机制。方法:利用自由基清除实验研究桔梗提取物对DPPH自由基的清除作用,通过体外酪氨酸酶抑制实验和斑马鱼黑素模型实验研究桔梗提取物改善皮肤色素沉着的功效,最后结合网络药理学探究... 详细信息

目的:探究桔梗提取物对皮肤色素沉着的功效及其作用机制。方法:利用自由基清除实验研究桔梗提取物对DPPH自由基的清除作用,通过体外酪氨酸酶抑制实验和斑马鱼黑素模型实验研究桔梗提取物改善皮肤色素沉着的功效,最后结合网络药理学探究桔梗活性成分改善皮肤色素沉着的作用机制。结果:桔梗提取物具有显著的抗氧化作用和酪氨酸酶抑制活性,对斑马鱼色素沉着也有显著的改善功效。网络药理学研究发现,桔梗提取物可能通过调节AKT1、TYR和IL-6等细胞靶点及调控PI3K-AKT和脂质代谢等机制通路改善色素沉着。结论:桔梗提取物具有改善色素沉着的功效。

关键词：桔梗自由基清除酪氨酸酶活性斑马鱼模型网络药理学

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New Discovery of the Jinshui Tin Deposit in the Middle Section of the East Kunlun Orogenic Belt,Northwestern China:Mineralization Age and Exploration Significance

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Journal of Earth Science 2024年第4期35卷 1373-1377页

作者： xingkai Zhang Shao-Yong Jiang Hui-Min Su Wei wang Qinglin Xia Yunpeng Liu Shien Li State Key Laboratory of Geological Processes and Mineral Resources Collaborative Innovation Center for Exploration of Strategic Mineral ResourcesSchool of Earth ResourcesChina University of GeosciencesWuhan 430074China Third Geological Exploration Institute of Qinghai Nonferrous Geological and Mineral Exploration Bureau Xining 810000China

Tin,as one of the most important critical metals,has at-tracted great attention worldwide(Jiang et al.,2023,2020).China has the largest amount of tin resources in the world,ac-counting for nearly one-fourth of the world’s total(Jiang et al.,2020;Chen and Sheng,2015).Tin deposits in China mainly occur in the Nanling Range in southern China,the Sanjiang Basin in southwestern China,and the Great Xing’an Range in northeastern China,which account for 98%of the country’s tin resources,whereas tin deposits are relatively rare in north-western China(Ni et al.,2023;Chen et al.,2014,1992).

关键词： Middle northeastern southwestern

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