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Study on Shear Strength Characteristics of Basalt-Concrete Bonding Interface Based on in-situ Direct Shear Test

Journal of Earth Science 2024年第2期35卷 553-567页

作者： Peng Xia Xinli Hu Chunye Ying shuangshuang wu Chu Xu Xuan Wang Hao Chen Hang Duan College of Harbour and Coastal Engineering Jimei UniversityXiamen361021China Faculty of Engineering China University of GeosciencesWuhan430074China China Three Gorges Construction Group Ltd.Beijing100038China

In rock engineering,the shear strength of the basalt-concrete bonding interface is a key factor affecting the shear performance of hydroelectric dam foundations,embedded rock piles and rock bolts.In this study,30 sets of in-situ direct shear tests were conducted on the basalt-concrete bond interface in the Baihetan dam area to investigate the shear strength characteristics of the basalt-concrete bonding interface.The bonding interface contains two states,i.e.,the bonding interface is not sheared,termed as se(symbolic meaning see Table 1);the bonding interface is sheared with rupture surface,termed as si.The effects of lithology,Joints structure,rock type grade and concrete compressive strength on the shear strength of the concrete-basalt contact surface were investigated.The test results show that the shear strength of the bonding interface(s_(e)&s_(i))of columnar jointed basalt with concrete is greater than that of the bonding interface(s_(e)&s_(i))of non-columnar jointed one with the same rock type grade.When the rock type grade isⅢ_(2),fcol is 1.22 times higher than fncol and ccol is 1.13 times greater than cncol.The shear strength parameters of the basalt-concrete bonding interface differ significantly for different lithologies.The cohesion of the bonding interface(s_(i))of cryptocrystalline basalt with concrete is 2.05 times higher than that of the bonding interface(s_(i))of breccia lava with concrete under the same rock type grade condition.Rock type grade has a large influence on the shear strength of the non-columnar jointed basalt-concrete bonding interface(s_(e)&s_(i)).cnol increases by 33%when the grade of rock type rises fromⅢ_(1)toⅡ_(1).the rock type grade has a greater effect on bonding interface(s_(i))cohesion than the coefficient of friction.When the rock type grade is reduced fromⅢ_(2)toⅢ_(1),f_(ncol)′increases by 2%and c_(ncol)′improves by 44%.The shear strength of the non-columnar jointed basalt-concrete bonding interface(s_(e)&s_(i))increases with the increase of the compressive strength of co

关键词： direct shear test basalt-concrete bonding interface shear strength parameters engineering geogolgy

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Synergistic fluorescent hydrogel actuators with selective spatial shape/color-changing behaviors via interfacial supramolecular assembly

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SmartMat 2024年第2期5卷 93-102页

作者： Wei Lu Ruijia Wang Muqing Si Yi Zhang shuangshuang wu Ning Zhu Wenqin Wang Tao Chen Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboChina School of Chemical Sciences University of Chinese Academy of SciencesBeijingChina Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingboChina College of Biotechnology and Pharmaceutical Engineering Nanjing Tech UniversityNanjingJiangsuChina

Biomimetic intelligent polymeric hydrogel actuators with cooperative fluorescence-color switchable behaviors are expected to find great potential applications in soft robotics,visual detection/display,and camouflage applications.However,it remains challenging to realize the spatial manipulation of synergistic shape/color-changing behaviors.Herein,we report an interfacial supramolecular assembly(ISA)approach that enables the construction of robust fluorescent polymeric hydrogel actuators with spatially anisotropic structures.On the basis of this ISA approach,diverse 2D/3D soft fluorescent hydrogel actuators,including chameleon-and octopi-shaped ones with spatially anisotropic structures,were facilely assembled from two different fluorescent hydrogel building blocks sharing the same physically cross-linked agar network.Spatially control over synergistic shape/color-changing behaviors was then realized in one single anisotropic hydrogel actuator.The proposed ISA approach is universal and expected to open promising avenues for developing powerful bioinspired intelligent soft actuators/robotics with selective spatial shape/color-changing behaviors.

关键词： actuator anisotropic structure interfacial supramolecular assembly multicolor fluorescent hydrogels self-gluing

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Construction of lightweight NiCo-LDH/carbon fiber nanocomposites for broad-band microwave absorption

ChemPhysMater

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ChemPhysMater 2024年第2期3卷 212-219页

作者： shuangshuang Liu Zhengying Shen Beibei Zhao Nannan wu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

The rapidly increasing usage of electric technology during the last decades has facilitated the fabrication of high-efficiency microwave absorption(MA)materials(MAMs).In this study,hierarchical NiCo layered double hydroxide(LDH)/carbon fiber(CF)nanocomposites were constructed via simple hydrothermal production,and their MA properties were evaluated.Benefiting from interfacial polarization,defect-induced polarization,and multiple reflections induced by the hierarchical sheets,the LDH/CF composites delivered a better MA perfor-mance than that by pure CF and LDH.The addition ratio of the LDH also played a vital role in determining the impedance matching and microwave absorption performance.Specifically,the optimized LDH/CF composites demonstrated an exceptional reflection loss(RL)of-62.47 dB with a thickness of 2.22 mm,and an effective absorption bandwidth(EAB)covering 6.4 GHz(11.6-18.0 GHz)at a 20 wt.%filling ratio,which outperformed the reported CF-based microwave absorbers.Owing to this superior MA,the as-prepared LDH/CF composites demonstrated to be significantly promising for advancing the usage of CF-based MAMs.

关键词： Microwave absorption Nickel cobalt layered double hydroxides Carbon fiber Interface polarization

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Histamine H1 Receptor in Basal Forebrain Cholinergic Circuit:A Novel Target for the Negative Symptoms of Schizophrenia?

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Neuroscience Bulletin 2022年第5期38卷 558-560页

作者： shuangshuang wu Chenshu Gao Feng Han Heming Cheng Key Laboratory of Neuropharmacology and Translational Medicine of Zhejiang Province School of Pharmaceutical SciencesZhejiang Chinese Medical UniversityHangzhou 310053China Key Laboratory of Cardiovascular and Cerebrovascular Medicine School of PharmacyNanjing Medical UniversityNanjing 211166China

Schizophrenia is a common and severe mental disorder with a lifetime prevalence of~1%[1]Apart from the typical positive symptoms,such as hallucinations and delusions,which mainly make patients seek medication,60%-70%of patients are tortured by negative symptoms(e.***.apathy and alogia)and cognitive deficits that impose a long-term burden on patients[2].

关键词： Schizophrenia patients medication

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Study on Shear Strength Characteristics of Columnar Jointed Basalt Based on in-situ Direct Shear Test at Baihetan Hydropower Station

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Journal of Earth Science 2023年第4期34卷 1280-1294页

作者： Peng Xia Xinli Hu shuangshuang wu Chunye Ying Chu Xu Xuan Wang Hao Chen Faculty of Engineering China University of GeosciencesWuhan 430074China China Three Gorges Construction Group Ltd.Beijing 100038China

Columnar jointed basalt(CJB) widely distributes in the dam site of the Baihetan Hydropower Station.The columnar joint structure and fracture development of CJB have significant influence on the mechanical properties of rock mass,and the mechanical properties of CJB are of great significance to the Baihetan Hydropower Project.Therefore,in-situ direct shear tests were carried out on ten test adit at different locations in the dam site area to study the shear behavior of CJB.In this study,21 sets of in-situ direct shear tests were conducted for rock types of type Ⅱ_(2),type Ⅲ_(1)and type Ⅲ_(2),with horizontal and vertical shear planes and two different specimen sizes of CJB.Shear strength parameters of CJB were obtained by linear fitting of in-situ direct shear test results based on the Mohr-Coulomb strength criterion.The results indicate that the shear strength parameters of CJB with horizontal shear plane increase as the increase of rock type grade.The shear strength parameters of CJB show obvious anisotropy and the friction coefficient of the horizontal shear plane is greater than the vertical shear plane.The friction coefficient in the horizontal direction of the shear plane is 1.27 times that in the vertical direction of the shear plane.With the increase of rock type grade,the difference of friction coefficient becomes larger.However,the cohesion changes little whether the shear plane is horizontal or vertical.In addition,the size effect of CJB in this area is significant.The shear strength parameters of large size(100 cm × 100 cm) specimens are lower than those of regular size(50 cm × 50 cm) specimens.The reduction of cohesion is greater than that of the friction coefficient.For rock type Ⅲ_(2),the cohesion of large-size specimens is 0.637 of the regular-size specimens.The reduction percentage of the friction coefficient for type Ⅲ_(2)is 1.66 times that of type Ⅲ_(1).The reduction percentage of the cohesion for type Ⅲ_(2)is 1.27 times that of type Ⅲ_(1).The size effect decreases with the increase of rock type

关键词： direct shear test columnar jointed basalt shear strength parameters in-situ processing.

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Slope Stability Analysis Based on Group Decision Theory and Fuzzy Comprehensive Evaluation

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Journal of Earth Science 2020年第6期31卷 1121-1132页

作者： Peng Xia Xinli Hu shuangshuang wu Chunye Ying Chang Liu Faculty of Engineering China University of GeosciencesWuhan 430074China

A slope stability evaluation method is proposed combining group decision theory,the analytic hierarchy process and fuzzy comprehensive evaluation.The index weight assignment of each evaluation element is determined by group decision theory and the analytic hierarchy process,and the membership degree of each indicator is determined based on fuzzy set theory.According to the weights and memberships,the membership degrees of the criterion layer are obtained by fuzzy operations to evaluate the slope stability.The results show that(1)the evaluation method comprehensively combines the effects of multiple factors on the slope stability,and the evaluation results are accurate;(2)the evaluation method can fully leverage the experience of the expert group and effectively avoid evaluation errors caused by the subjective bias of a single expert;(3)based on a group decision theory entropy model,this evaluation method can quantitatively evaluate the reliability of expert decisions and effectively improve the efficiency of expert group discussion;and(4)the evaluation method can transform the originally fuzzy and subjective slope stability evaluation into a quantitative evaluation.

关键词： group decision theory analytic hierarchy process fuzzy comprehensive evaluation slope stability

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柔性界面分子智能感知

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Science Bulletin 2024年第5期69卷 578-582页

作者：吴双双刘松瑞李婷李金星汪联辉王婷 State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Biomedical Engineering and Institute for Quantitative Health Science and Engineering(IQ) Michigan State UniversityEast Lansing MI 48823USA

A series of captivating and intricate information exchanges occur on soft interfaces(such as cells interface,tissue surface or soft epidermis),whether among simple microorganisms like bacteria or in the most complex organisms like humans,such as ion diffusion across capillary membranes,neurotransmitter exchanges among synapses,and sweat secretion through sweat glands.Decoding these signals and emulating these interactions on biological interfaces will contribute to a better understanding of physiological processes and diseases,as well as the study of the humanmachine interface.One example is continuous real-time monitoring of physiological cues,like glucose levels in sweat,allowing for effective diabetes assessment and timely insulin therapy[1].

关键词：智能感知 diseases capillary

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关闭煤矿矿井水中“双源”铁污染的电化学机理实验模拟

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煤炭科学技术 2024年第3期52卷 323-331页

作者：周来叶涛郑双双朱雪强吴江峰江苏省老工业基地资源利用与生态修复协同创新中心江苏徐州221116 中国矿业大学环境与测绘学院江苏徐州221116 徐州矿务集团有限公司江苏徐州221000

关闭煤矿矿井水多呈现高铁特征,闭坑淹井后残留铁质器件易锈蚀,与含铁矿物形成矿井水“双源”铁污染体系,在闭坑后不同时期贡献铁的释放,形成地下水环境风险。为明确关闭煤矿矿井水中双源铁释放过程与反应机理,刻画铁污染双源释放方式,... 详细信息

关闭煤矿矿井水多呈现高铁特征,闭坑淹井后残留铁质器件易锈蚀,与含铁矿物形成矿井水“双源”铁污染体系,在闭坑后不同时期贡献铁的释放,形成地下水环境风险。为明确关闭煤矿矿井水中双源铁释放过程与反应机理,刻画铁污染双源释放方式,量化释放速率比,基于电化学模拟原理,以黄铁矿和矿用锚杆为模拟“双源”,制备成工作电极,利用循环伏安法和极化法等电化学方法以及X射线光电子能谱材料表面表征技术,对煤矿关闭初期双源共存下在酸性矿井水环境中氧化还原反应过程与铁释放机制进行了模拟研究。结果表明,溶解氧含量是影响黄铁矿和锚杆在酸性矿井水中发生氧化还原反应的重要抑制因素。黄铁矿与锚杆的氧化机制不同,黄铁矿在氧化过程中表面出现钝化效应,2种材料的最终氧化产物均为Fe^(3+)和SO_(4)^(2-)黄铁矿主要通过矿物表面的Fe^(2+)发生氧化反应释铁,锚杆主要通过材料表面铁及其氧化产物与溶液中酸性物质的反应释铁,且铁氧化物较单质铁优先反应。在模拟富氧(DO=7.0 mg/L)酸性矿井水中,黄铁矿和锚杆的年腐蚀速率分别达到8.3636 mm/a和7.8314 mm/a,估算年释铁速率分别达到1.2240 g/a和3.9395 g/a。在模拟井下低氧(DO=3.5 mg/L)酸性矿井水中,黄铁矿和锚杆的年腐蚀速率分别达到0.7324 mm/a和0.3642 mm/a,估算年释铁速率分别达到0.1072 g/a和0.1832 g/a。综合电化学参数与静态释铁实验表明,在溶解氧充足或缺乏的条件下,总体释铁速率比均为双源>锚杆>黄铁矿。

关键词：关闭煤矿酸性矿井水双源释放铁污染电化学机理

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基于Logit模型的技术供需交易影响因素分析

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科技管理研究 2024年第7期44卷 80-86页

作者：何喜军石安杰吴爽爽武玉英北京工业大学经济与管理学院北京100124

将技术供方和专利视为整体,将供需双方是否通过某专利交易视为被解释变量,系统研究技术特征、组织实力和供需方多维邻近关系等对技术交易的影响。基于Logit模型对燃料电池领域专利数据实证研究发现:(1)考虑三维特征建立Logit模型,对交... 详细信息

将技术供方和专利视为整体,将供需双方是否通过某专利交易视为被解释变量,系统研究技术特征、组织实力和供需方多维邻近关系等对技术交易的影响。基于Logit模型对燃料电池领域专利数据实证研究发现:(1)考虑三维特征建立Logit模型,对交易形成预测的精度高达83.3%;(2)技术特征、组织实力特征、多维邻近特征对技术交易均有显著正向影响;(3)多维邻近特征对技术交易的促进程度远高于其他维度特征,供需双方信任是交易形成的关键因素。最后,从建立高质量技术供需数据库、技术交易信任体系、技术交易网络及交易推荐机制等方面提出对策思考。

关键词：多维邻近性技术特征技术供需交易 Logit模型

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基于空气花粉表征的北京地区植物花期物候的区域差异

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中国科学院大学学报（中英文） 2024年第4期41卷 517-523页

作者：孙爱芝吴双双李雪银叶彩华中国科学院大学地球与行星科学学院中国科学院计算动力学重点实验室北京101408 中国科学院大学北京燕山地球关键带国家野外观测研究站北京100049 北京市气象服务中心北京100097

空气花粉是不同时空纬度下物候学事件的有力佐证之一。利用北京地区2个研究点(怀柔区、石景山区)的伞蓬式花粉采样器采集2020年3月1日—5月31日期间的空气花粉,从空气花粉的角度研究春季开花植物花期物候的区域特征,并探讨开花始期和花... 详细信息

空气花粉是不同时空纬度下物候学事件的有力佐证之一。利用北京地区2个研究点(怀柔区、石景山区)的伞蓬式花粉采样器采集2020年3月1日—5月31日期间的空气花粉,从空气花粉的角度研究春季开花植物花期物候的区域特征,并探讨开花始期和花期与气温的关系。研究结果表明:(1)怀柔、石景山2个区域的春季空气花粉类型及含量存在一定的区域差异。怀柔区空气花粉分属18个科属,以柏科花粉最多(65%),其次是杨属、松属、榆属和蔷薇科;石景山区空气花粉分属16个科属,虽仍以柏科花粉为主(41%),但含量低于怀柔区,豆科、榆属和木樨科含量次之。(2)2个区域春季主要开花植物的开花始期和花期也存在差异,表现为春季温度更高的石景山区植物开花始期除杨属(晚2 d)外,均早于怀柔区,平均早约7 d。(3)同一区域不同时期随着气温的升高,春季开花植物开花始期、花期呈现明显的提前趋势。这与前人基于植物物候观测的结果基本一致,说明利用空气花粉监测也能很好地反映植物开花物候的时间和状态,可为植物物候学研究提供多学科和多角度的补充与参考。

关键词：空气花粉开花始期花期怀柔区石景山区

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