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Stress-strain relationship for reactive powder concrete with recycled powder under uniaxial compression

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1015-1027页

作者： Peng zhu Yunming zhu Wenjun QU Liyu XIE College of Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education Tongji UniversityShanghai 200092China

The recycled powder(RP)from construction wastes can be used to partially replace cement in the preparation of reactive powder *** this paper,reactive powder concrete mixtures with RP partially replacing cement,and natural sand instead of quartz,are *** curing is used,instead of steam curing that is normally requested by standard for reactive powder *** influences of RP replacement ratio(0%,10%,20%,30%),silica fume proportion(10%,15%,20%),and steel fiber proportion(0%,1%,2%)are *** effects of RP,silica fume,and steel fiber proportion on compressive strength,elastic modulus,and relative absorption energy are analyzed,and theoretical models for compressive strength,elastic modulus,and relative absorption energy are established.A constitutive model for the uniaxial compressive stress-strain relationship of reactive powder concrete with RP is *** the increase of RP replacement ratio from 0% to 30%,the compressive strength decreases by 42% and elastic modulus decreases by 24%.

关键词： recycled powder reactive powder concrete elastic modulus relative absorbed energy stress-strain relationship

Introduction to the first Jeme Tien Yow Lecture

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Underground Space 2024年第5期18卷 1-2页

作者： Hehua zhu Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

The Jeme Tien Yow Lecture is in honor of *** Tien Yow(1861–1919),the pioneer of tunneling and underground space engineering in China and also renowned as the"Father of Modern Chinese Engineering".The lecture is hosted and organized by the journal of Underground ***-Min Zhang will deliver the first Jeme Tien Yow Lecture on May 26th,2024,at RM101,College of Civil Engineering,Tongji University,Shanghai,*** has submitted the corresponding research paper,coauthored with ***,for publication in the journal of Underground *** are delighted to see its publication together with this brief introduction.

关键词： journal underground Tie

石墨烯/聚苯胺复合材料的制备及防腐性能的研究

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涂料工业 2022年第3期52卷 10-18页

作者：姜云龙朱爱萍扬州大学化学化工学院江苏扬州225002 扬州市维纳复合材料科技有限公司江苏扬州225009

利用苯胺与石墨烯(GNP)间形成的电子相互作用,首先将苯胺吸附到未经过任何化学衍生化的石墨烯表面,然后在GNP表面进行苯胺的氧化聚合,合成石墨烯/聚苯胺(GNP/PANI)纳米复合材料,并将其作为填料加入水性丙烯酸氨基烤漆中。通过透射电镜(T... 详细信息

利用苯胺与石墨烯(GNP)间形成的电子相互作用,首先将苯胺吸附到未经过任何化学衍生化的石墨烯表面,然后在GNP表面进行苯胺的氧化聚合,合成石墨烯/聚苯胺(GNP/PANI)纳米复合材料,并将其作为填料加入水性丙烯酸氨基烤漆中。通过透射电镜(TEM)、紫外-可见光谱(UV-Vis)、红外光谱(FT-IR)、电化学活性分析(CV)等表征及测试纳米复合材料的结构与性能,通过阻抗和极化曲线测试涂层的防腐性能。结果表明:与GNP和PANI相比,GNP/PANI纳米复合涂层的防腐性能最佳,其主要防腐机理为纳米阻隔效应和金属表面催化钝化作用。将纳米材料作为防腐填料应用到水性环氧涂料中,耐中性盐雾可达1440 h,具有很好的应用前景。

关键词：石墨烯聚苯胺复合材料防腐性能

Carbon Emission Effects Driven by Evolution of Chinese Dietary Structure from 1987 to 2020

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Chinese Geographical Science 2024年第1期34卷 181-194页

作者： zhu Yuanyuan ZHANG Yan zhu Xiaohua Key Laboratory of Geographic Process Analysis&Simulation Hubei Province Central China Normal UniversityWuhan430079China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China

Exploring carbon emission effects based on the evolution of residents’ dietary structure to achieve the carbon neutrality goal and mitigate climate change is an important *** study took China as the research object(data excluding Hong Kong,Macao and Taiwan) and used the carbon emission coefficient method to quantitatively measure the food carbon emissions from 1987–2020,then analyzed the carbon emission effects under the evolution of dietary *** results showed that during the study period,the Chinese dietary structure gradually changed to a high-carbon consumption *** dietary structure of urban residents developed to a balanced one,while that of rural residents developed to a high-quality *** the study period,the per capita food carbon emissions and total food consumption of Chinese showed an increasing *** per capita food carbon emissions of residents in urban and rural showed an overall upward *** total food carbon emissions in urban increased significantly,while that in rural increased first and then *** influence of beef and mutton on carbon emissions is the highest in dietary *** with the balanced dietary pattern,the food carbon emissions of Chinese residents had not yet reached the peak,but were evolving to a high-carbon consumption pattern.

关键词： dietary structure structural evolution carbon emission effects carbon neutrality China

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高强轻骨料混凝土无腹筋梁抗剪承载力研究

建筑结构 2019年第10期49卷 70-75页

作者：胡晨张川朱爱萍重庆大学土木工程学院重庆400045 重庆大学山地城镇建设与新技术教育部重点实验室重庆400045 中国建筑科学研究院有限公司北京100013

为了进一步评价我国现行的《轻骨料混凝土结构技术规程》(JGJ 12—2006)中无腹筋梁抗剪承载力计算公式对于高强轻骨料混凝土的适用性,收集整理了公开发表的186根无腹筋轻骨料混凝土梁试验结果,着重研究了混凝土强度、剪跨比、纵筋率、... 详细信息

为了进一步评价我国现行的《轻骨料混凝土结构技术规程》(JGJ 12—2006)中无腹筋梁抗剪承载力计算公式对于高强轻骨料混凝土的适用性,收集整理了公开发表的186根无腹筋轻骨料混凝土梁试验结果,着重研究了混凝土强度、剪跨比、纵筋率、混凝土密度等因素对抗剪承载力的影响规律。在此基础上,采用中、美、日规程或规范提供的抗剪承载力公式以及部分建议公式对试验结果进行了预测分析对比,对各计算公式的准确性进行了定量评价,提出了修正的无腹筋轻骨料混凝土梁的抗剪承载力计算公式。结果表明,修正的公式对于轻骨料混凝土无腹筋梁抗剪承载力的预测更加准确。

关键词：高强轻骨料混凝土无腹筋梁抗剪承载力

考虑地面运动不确定性的地面运动记录选择方法研究

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土木工程学报 2016年第9期49卷 42-52页

作者：王敏朱爱萍丁袁媛白绍良傅剑平重庆大学重庆400045 中国建筑科学研究院北京100013

分析国内外当前地面运动记录选择方法后,重点指出我国方法中值得改进之处,提出考虑地面运动记录不确定性的地面运动记录选择方法。并建立Ⅱ类场地地面运动数据库,给出不同震级和距离分组下加速度动力放大系数谱分布规律,以此体现地面运... 详细信息

分析国内外当前地面运动记录选择方法后,重点指出我国方法中值得改进之处,提出考虑地面运动记录不确定性的地面运动记录选择方法。并建立Ⅱ类场地地面运动数据库,给出不同震级和距离分组下加速度动力放大系数谱分布规律,以此体现地面运动的不确定性。最后,以一个工程算例来展示考虑地面运动不确定性的地面运动记录选择方法的应用过程和结果。算例的动力时程分析结果表明,由此预测出的结构模型地震反应确实存在着一个明显的分布范围,克服了当前拟合单一目标谱的地面运动记录选择方法抹杀地面运动不确定性的弊端,为全面了解结构在一定地震风险下抗震性能提供可能。

关键词：长周期抗震性能地面运动不确定性

Designing hierarchical structures for innovative cooling textile

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Nano Research 2024年第10期17卷 9202-9224页

作者： Xiran Du Jinlei Li Bin zhu Jia zhu National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210023China School of Sustainable Energy and Resources Nanjing UniversitySuzhou 215163China

The potential of personal cooling technologies in reducing air conditioning energy consumption and enhancing human thermal comfort is *** review focuses on recent advancements in hierarchical structure design for innovative cooling *** with insights into fundamental heat transfer processes between the human body,textile,and the surroundings,we uncover key control *** the advanced hierarchical structure designs enabling effective radiation,sweat evaporation,conduction management,and integration of cold energy sources for realizing effective human body cooling are systematically ***,we explore multifunctional designs beyond cooling,including switchable cooling-heating and ***,we engage in discussions on unifying cooling performance tests and additional multiple requirements to make strides toward practical *** review is anticipated to be a valuable resource,providing the scientific and industrial communities with a quick grasp of past advancements,current challenges,and future directions in achieving effective human body cooling.

关键词： thermal comfort personal cooling textile hierarchical structures

Old Pinus massoniana forests benefit more from recent rapid warming in humid subtropical areas of central-southern China

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Journal of Forestry Research 2024年第5期35卷 155-170页

作者： Wenxin Li Liangjun zhu Lianhua zhu Mengdan Jing Censhi Qian Yu zhu Paolo Cherubini College of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004People’s Republic of China Swiss Federal Institute for Forest Snow and Landscape Research WSL8903 BirmensdorfSwitzerland Department of Forest and Conservation Sciences Faculty of ForestryUniversity of British Columbia2004-2424 Main MallVancouverBC V6T 1Z4Canada

Trees progress through various growth stages,each marked by specific responses and adaptation strate-gies to environmental *** the importance of age-related growth responses on overall forest health and management policies,limited knowledge exists regarding age-related effects on dendroclimatic relationships in key subtropical tree *** this study,we employed a den-drochronological method to examine the impact of rapid warming on growth dynamics and climatic sensitivity of young(40–60 years)and old(100–180 years)Pinus mas-soniana forests across six sites in central-southern *** normalized log basal area increment of trees in both age groups increased significantly following rapid warming in *** in young forests further showed a distinct growth decline during a prolonged severe drought(2004–2013),whereas those in old forests maintained growth *** growth was more strongly influenced by temperature than by moisture,particularly in old *** tem-peratures strongly and positively impacted the growth of old trees but had a weaker effect on young *** forests had a significantly lower resistance to extreme drought but faster recovery compared to young ***“divergence problem”was more pronounced in younger forests due to their heightened sensitivity to warming-induced drought and heat *** ongoing warming,young forests also may initially experience a growth decline due to their heightened sensitivity to winter *** findings underscore the importance of considering age-dependent changes in forest/tree growth response to warming in subtropical forest man-agement,particularly in the context of achieving“Carbon Peak&Carbon Neutrality”goals in China.

关键词： Tree rings Pinus massoniana Age effects Drought resilience Subtropical forests Rapid warming

A review of recent advances in the effects of surface and interface properties on marine propellers

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Friction 2024年第2期12卷 185-214页

作者： Manfu zhu Liran MA State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Marine propellers are important propulsion devices for both surface ships and underwater *** severe environmental problems have required further performance enhancement for ***,traditional methods to improve propeller performances through geometrical and structural optimizations have been extensively investigated,while the underlying mechanisms of the effects of surface and interface properties on marine propellers are still far from being fully *** paper presented a comprehensive review of recent advances in the effects of surface and interface properties,such as surface roughness and surface wettability,on marine propellers with an emphasis on the significant improvements in both hydrodynamic and cavitation performances,hoping to arouse more in-depth investigations in the field of surface/interface science and technologies on marine propellers,and also promote the state-of-the-art technologies,such as superlubricity technology,into practical applications.

关键词： marine propellers hydrodynamics cavitation surface roughness surface wettability