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Mechanical behavior of 2G NPR bolt anchored rock samples under static disturbance loading

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Journal of Mountain Science 2024年第7期21卷 2494-2516页

作者： WANG Jiong jianG jian WANG siyu CHANG Yiwen LIU Peng HE Manchao CHENG Shuang State Key Laboratory for Tunnel Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China

The deep mining of coal resources is accompanied by severe environmental challenges and various potential engineering *** implementation of NPR(negative Poisson's ratio)bolts are capable of controlling large deformations in the surrounding rock *** paper focuses on studying the mechanical properties of the NPR bolt under static disturbance *** deep nonlinear mechanical experimental system was used to study the mechanical behavior of rock samples with different anchored types(unanchored/PR anchored/2G NPR anchored)under static disturbance *** whole process of rock samples was taken by high-speed camera to obtain the real-time failure characteristics under static disturbance *** the same time,the acoustic emission signal was collected to obtain the key characteristic parameters of acoustic emission such as acoustic emission count,energy,and *** deformation at the failure of the samples was calculated and analyzed by digital speckle *** findings indicate that the failure mode of rock is influenced by different types of *** peak failure strength of 2G NPR bolt anchored rock samples exhibits an increase of 6.5%when compared to the unanchored rock *** cumulative count and cumulative energy of acoustic emission exhibit a decrease of 62.16%and 62.90%,*** maximum deformation of bearing capacity exhibits an increase of 59.27%,while the failure time demonstrates a delay of 42.86%.The peak failure strength of the 2G NPR bolt anchored ones under static disturbance load exhibits an increase of 5.94%when compared to the rock anchored by PR(Poisson's ratio)*** cumulative count and cumulative energy of acoustic emission exhibit a decrease of 47.16%and 43.86%,*** maximum deformation of the bearing capacity exhibits an increase of 50.43%,and the failure time demonstrates a delay of 32%.After anchoring by 2G NPR bolt,anchoring support effectively reduces the risk of damage caused by s

关键词： Anchored rock samples Static disturbance load Acoustic emission characteristics Digital speckle Negative Poisson's ratio

Eco-Friendly Encapsulation of Metal Clusters in Porous Organic Cages for Engineerable Microenvironment and Enhanced Catalysis

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CCS Chemistry 2024年第9期6卷 2186-2197页

作者： siyu Ren Liangxiao Tan Jun-Hao Zhou jian Sun Peng Zhang Xingzhong Cao Yun-Hong Zhang jian-Ke Sun MOE Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049

Developing artificial catalysts that mimic the functionality of enzymes and adapt to the surrounding microenvironment to achieve specific activity and selectivity is a fascinating research area yet remains a great *** this work,we present a meticulously designed strategy for the successful encapsulation of ultrasmall metal clusters(MCs)within an amine-type porous organic cage(POC)through electrostatic complexation,phase transfer,and alcohol reduction *** amine cage showcases an intriguing and customizable feature that allows for the regulation of the surrounding microenvironment of the confined MCs through a feasible postmodifi-cation *** functionalization of cage skeleton further facilitates precise adjustment to the surface electronic state of Pd cluster,thereby influencing the adsorption behavior of ***,this controlled regulation leads to modified activity and chemoselectivity in the catalytic hydrogenation of halogenated ***,the investigation of the correlation between the surrounding microenvironment,substrate adsorption,and catalytic performance in the POC-immobilized MCs system has not been previously *** anticipate that our research will provide valuable insights in this field.

关键词： metal cluster porous organic cage encapsulation microenvironment catalysis

Guided bone regeneration in long-bone defect with a bilayer mineralized collagen membrane

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Collagen and Leather 2024年第1期5卷 85-100页

作者： Fuli Peng Xuelei Zhang Yilei Wang Rui Zhao Zhiwei Cao siyu Chen Yunxuan Ruan Jingjing Wu Tianxi Song Zhiye Qiu Xiao Yang Yi Zeng Xiangdong Zhu jian Pan Xingdong Zhang Department of Orthopedics West China HospitalOrthopedic Research InstituteSichuan University National Engineering Research Center for Biomaterials Sichuan University Chengdu Integrated TCM and Western Medicine Hospital Chengdu First People's Hospital Department of Inspection School of MedicineJiangsu University State Key Laboratory of Oral Diseases and National Center for Stomatology and National Clinical Research Center for Oral Diseases Department of Oral and Maxillofacial SurgeryWest China Hospital of StomatologySichuan University State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua University

Bone regeneration for large,critical-sized bone defects remains a clinical challenge *** bone regeneration(GBR) is a promising technique for the repair of multiple bone defects,which is widely used in oral and maxillofacial bone defects but is still unsatisfied in the treatment of long bone ***,we successfully fabricated a bilayer mineralized collagen/collagen(MC/Col)-GBR membrane with excellent osteoinductive and barrier function by coating the MC particles prepared via in situ biomimetic mineralization process on one side of a sheet-like pure collagen *** aim of the present study was to investigate the physicochemical properties and biological functions of the MC/Col film,and to further evaluate its bone regeneration efficiency in large bone defect *** infrared spectra and X-ray diffraction patterns confirmed the presence of both hydroxyapatite and collagen phase in the MC/Col film,as well as the chemical interaction between *** microscope,scanning electron microscopy and atomic force microscope showed the uniform distribution of MC particles in the MC/Col film,resulting in a rougher surface compared to the pure Col *** quantitative analysis of surface contact angle,light transmittance and tensile strength demonstrated that the MC/Col film have better hydrophilicity,mechanical properties,light-barrier properties,*** vitro macrophage co-culture experiments showed that the MC/Col film can effectively inhibit macrophage proliferation and fusion, reducing fibrous capsule *** vivo bone repair assessment of a rabbit critical segmental radial defect proved that the MC/Col film performed better than other groups in promoting bone repair and regeneration due to their unique dual osteoinductive/barrier *** findings provided evidence that MC/Col film has a great clinical potential for effective bone defect repair.

关键词： Mineralized collagen Collagen Guided bone regeneration Artificial periosteum Bone defect repair

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塔中隆起古生代构造演化的分段差异性分析

化工矿产地质 2016年第4期38卷 215-220页

作者：李萌逄思宇郭健中国冶金地质总局矿产资源研究院北京101300 中化地质矿山总局化工地质调查总院北京100013

应用平衡剖面技术探讨了塔中隆起东、西段古生代构造演化的时空差异性。结果表明,早奥陶世塔中西段在伸展背景下拉张沉降,而塔中东段已出现隆起雏形。中奥陶世-晚奥陶世,塔中隆起构造形态基本定型,东段构造变形和隆升强度高于西段。该... 详细信息

应用平衡剖面技术探讨了塔中隆起东、西段古生代构造演化的时空差异性。结果表明,早奥陶世塔中西段在伸展背景下拉张沉降,而塔中东段已出现隆起雏形。中奥陶世-晚奥陶世,塔中隆起构造形态基本定型,东段构造变形和隆升强度高于西段。该区东强西弱的分段差异性持续到中泥盆世末期。推测与来自阿尔金方向的压扭应力自东向西逐渐递减有关,同时形成了塔中隆起东敛西散的构造形态。

关键词：塔中隆起古生代构造演化分段差异

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基于对比学习的多兴趣感知序列推荐系统

计算机研究与发展 2024年第7期61卷 1730-1740页

作者：赵容梅孙思雨鄢凡力彭舰琚生根四川大学计算机学院成都610065

序列推荐的近几年工作通过聚类历史交互物品或者利用图卷积神经网络获取交互的多层次关联信息来细化用户兴趣.然而,这些方法没有考虑具有相似行为模式的用户之间的相互影响以及交互序列中时间间隔不均匀对用户兴趣的影响.基于上述问题,... 详细信息

序列推荐的近几年工作通过聚类历史交互物品或者利用图卷积神经网络获取交互的多层次关联信息来细化用户兴趣.然而,这些方法没有考虑具有相似行为模式的用户之间的相互影响以及交互序列中时间间隔不均匀对用户兴趣的影响.基于上述问题,提出一种基于对比学习的多兴趣感知序列推荐模型MIRec,一方面考虑了序列内部的物品依赖和位置依赖等局部偏好信息,另一方面通过图信息聚合机制获取相似用户之间的全局偏好信息;然后将融合局部偏好和全局偏好的用户表示输入胶囊网络中,学习用户交互序列中的多兴趣表示;最后通过对比学习使用户的历史交互序列靠近增强的交互序列,获得对时间间隔不敏感的用户多兴趣表示,为用户提供更准确的推荐.所提模型在2个真实数据集上进行了充分实验,实验结果验证了所提模型的有效性.

关键词：多兴趣全局偏好局部偏好胶囊网络序列推荐

An overview for monitoring and prediction of pathogenic microorganisms in the atmosphere

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Fundamental Research 2024年第3期4卷 430-441页

作者： jianping Huang Danfeng Wang Yongguan Zhu Zifeng Yang Maosheng Yao Xiaoming Shi Taicheng An Qiang Zhang Cunrui Huang Xinhui Bi jiang Li Zifa Wang Yongqin Liu Guibing Zhu siyu Chen jian Hang Xinghua Qiu Weiwei Deng Huaiyu Tian Tengfei Zhang Tianmu Chen Sijin Liu Xinbo Lian Bin Chen Beidou Zhang Yingjie Zhao Rui Wang Han Li Collaborative Innovation Center for Western Ecological Safety College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China National Clinical Research Center for Respiratory Disease Guangzhou Institute of Respiratory HealthFirst Affiliated Hospital of Guangzhou Medical UniversityState Key Laboratory of Respiratory Disease(Guangzhou Medical University)Guangzhou 510230China College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Vanke School of Public Health Tsinghua UniversityBeijing 100084China State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Center for Pan-third Pole Environment Lanzhou UniversityLanzhou 730000China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 510640

Corona virus disease 2019(COVID-19)has exerted a profound adverse impact on human *** have demonstrated that aerosol transmission is one of the major transmission routes of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Pathogenic microorganisms such as SARS-CoV-2 can survive in the air and cause widespread infection among *** monitoring of pathogenic microorganism transmission in the atmosphere and accurate epidemic prediction are the frontier guarantee for preventing large-scale epidemic *** of pathogenic microorganisms in the air,especially in densely populated areas,may raise the possibility to detect viruses before people are widely infected and contain the epidemic at an earlier *** multi-scale coupled accurate epidemic prediction system can provide support for governments to analyze the epidemic situation,allocate health resources,and formulate epidemic response *** review first elaborates on the effects of the atmospheric environment on pathogenic microorganism transmission,which lays a theoretical foundation for the monitoring and prediction of epidemic ***,the monitoring technique development and the necessity of monitoring pathogenic microorganisms in the atmosphere are summarized and ***,this review introduces the major epidemic prediction methods and highlights the significance to realize a multi-scale coupled epidemic prediction system by strengthening the multidisciplinary cooperation of epidemiology,atmospheric sciences,environmental sciences,sociology,demography,*** summarizing the achievements and challenges in monitoring and prediction of pathogenic microorganism transmission in the atmosphere,this review proposes suggestions for epidemic response,namely,the establishment of an integrated monitoring and prediction platform for pathogenic microorganism transmission in the atmosphere.

关键词： Aerosol transmission Epidemic monitoring methods Epidemic prediction modelsEpidemic response Multidisciplinary cooperation

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辽宁省农田土壤有机碳含量特征与影响因素

生态学杂志 2024年第9期43卷 2769-2776页

作者：陈思宇律泽张仰王健李国琛王超沈阳建筑大学市政与环境工程学院沈阳110168 中国科学院沈阳应用生态研究所沈阳110016 辽宁省陆地生态系统碳中和重点实验室沈阳110016

作为中国重要粮食生产基地的东北农田,由于不合理利用,土壤有机碳含量出现逐年下降的趋势。本研究以辽宁省典型作物玉米和水稻土壤为对象,共采集444份土壤样品,分析土壤有机碳及其组分(微生物生物量碳、死亡残体碳和可溶性有机碳)的含量... 详细信息

作为中国重要粮食生产基地的东北农田,由于不合理利用,土壤有机碳含量出现逐年下降的趋势。本研究以辽宁省典型作物玉米和水稻土壤为对象,共采集444份土壤样品,分析土壤有机碳及其组分(微生物生物量碳、死亡残体碳和可溶性有机碳)的含量,并解析影响有机碳的关键因素。结果表明:水稻田土壤有机碳(SOC)、微生物生物量碳(MBC)含量和MBC/SOC值均高于玉米田土壤,而水稻田土壤可溶性有机碳含量、细菌残体碳、真菌残体碳和土壤残体碳总量低于玉米田土壤;相关分析显示,玉米田和水稻田的SOC与MBC和微生物残体碳具有显著正相关性;回归分析显示,水稻田SOC与MBC和微生物残体碳的斜率较低;随机森林模型分析显示,土壤C/N和真菌残体碳是玉米田和水稻田土壤SOC的关键影响因素,但两者对玉米田土壤SOC的解释度更高;玉米田和水稻田SOC组分及关键影响因素存在显著差异,微生物周转过程对玉米田SOC影响更大,土壤性质对水稻田SOC含量起到主要影响。本研究为科学调控东北农田土壤有机碳提供基础数据和理论基础。

关键词：土壤有机碳微生物生物量碳微生物残体碳

韧性城市视角下城市高密度商业区空间设计策略

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城市建筑 2024年第1期21卷 91-94页

作者：刘思羽唐建大连理工大学建筑与艺术学院

随着城市化进程的不断推进,城市所面对的不可完全预测灾害也随之而来,韧性城市的构建也愈加重要。城市中的高密度商业区作为反映城市经济发展的重要因素之一,提高其对灾害的应对以及适应能力是推进城市韧性建设的基础。文章以徐州市苏... 详细信息

随着城市化进程的不断推进,城市所面对的不可完全预测灾害也随之而来,韧性城市的构建也愈加重要。城市中的高密度商业区作为反映城市经济发展的重要因素之一,提高其对灾害的应对以及适应能力是推进城市韧性建设的基础。文章以徐州市苏宁广场彭城店为例,以韧性城市理念为导向,分析高密度商业区道路空间、广场空间以及商业设施空间,从防火减灾、紧急疏散、内部调节这三个方面探讨高密度商业区空间防灾设计策略,以期推动高密度商业区韧性建设与韧性城市的构建。

关键词：韧性城市空间防灾商业区设计策略

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新零售背景下安徽省零售业与物流业耦合研究

物流科技 2024年第1期47卷 43-46页

作者：杨健毕斯妤安徽理工大学经济与管理学院安徽淮南232001

新零售风暴的来袭加快物流业发展,物流系统更是向智慧物流体系转型。以安徽省为例,选择2016—2020年安徽省零售业与物流业的相关数据,利用耦合协调模型和灰色关联度模型进行实证分析,结果表明:2016至2020年安徽省零售业与物流业耦合程... 详细信息

新零售风暴的来袭加快物流业发展,物流系统更是向智慧物流体系转型。以安徽省为例,选择2016—2020年安徽省零售业与物流业的相关数据,利用耦合协调模型和灰色关联度模型进行实证分析,结果表明:2016至2020年安徽省零售业与物流业耦合程度不断提高,从中度失调过渡到勉强协调。零售业与物流业发展关联度较大,具备联动发展的基础。针对分析结果提出促进零售业转型升级、构建全渠道物流、加强物流基础设施建设、创新物流业态模式、培养物流专业人才的建议。

关键词：新零售智慧物流耦合度