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饱水轻骨料和减缩剂对UHPC水化过程和自收缩的影响

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材料导报 2020年第22期34卷 22065-22069页

作者：徐彬彬欧忠文罗伟刘娜袁旺付来平中国人民解放军陆军勤务学院军事设施系重庆400030 四川轻化工大学材料科学与工程学院自贡643000

通过测试超高性能混凝土(UHPC)的凝结时间、抗压强度、水化热、自收缩和相对湿度,研究了饱水轻骨料、减缩剂(SRA)和两者综合作用对UHPC水化过程和自收缩的影响。结果表明:饱水轻骨料和SRA都可降低UHPC自收缩,当轻骨料掺量为50%时,自收... 详细信息

通过测试超高性能混凝土(UHPC)的凝结时间、抗压强度、水化热、自收缩和相对湿度,研究了饱水轻骨料、减缩剂(SRA)和两者综合作用对UHPC水化过程和自收缩的影响。结果表明:饱水轻骨料和SRA都可降低UHPC自收缩,当轻骨料掺量为50%时,自收缩显著降低,为基准组的7.2%,其原因为内养护水在4 d内缓慢释放,缓解自干燥效应,这说明内养护是降低自收缩十分有效的方式,但UHPC的力学性能显著降低。同时发现低掺量轻骨料和SRA对抑制UHPC自收缩发挥着协同效应,并且轻骨料的多孔结构对SRA存在着一定的吸附效应,可降低初期孔溶液中SRA的有效含量,共同维持内部相对湿度以减小自收缩,同时缓解对早期强度和水化过程的不利影响。

关键词：超高性能混凝土(UHPC) 饱水轻骨料减缩剂(SRA) 水化过程自收缩

纤维增强金属基复合材料整体蠕变性能的细观力学分析

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力学季刊 2022年第3期43卷 490-501页

作者：杨舒博徐彬彬王华国凤林上海交通大学船舶海洋与建筑工程学院工程力学系上海200240 上海应用技术大学机械工程学院上海201418

高温下金属基复合材料的蠕变主要由基体蠕变和界面扩散蠕变两部分构成,以往的研究中常常只考虑其中一种蠕变机理,从而导致得到的规律具有较大的局限性.本文提出了一种可预测金属基复合材料整体蠕变性能的细观力学方法,同时考虑了基体蠕... 详细信息

高温下金属基复合材料的蠕变主要由基体蠕变和界面扩散蠕变两部分构成,以往的研究中常常只考虑其中一种蠕变机理,从而导致得到的规律具有较大的局限性.本文提出了一种可预测金属基复合材料整体蠕变性能的细观力学方法,同时考虑了基体蠕变和界面扩散蠕变两种蠕变机理,导出了具有张量形式并满足不可压缩性的界面扩散蠕变应变表达式.采用Mori-Tanaka法和自洽法二者结果的平均以便更准确地计算纤维中的应力,揭示了两种蠕变机理相互影响的竞争关系.研究了恒定双轴荷载下的总体蠕变和固定位移约束下的应力松弛这两种常见蠕变问题,探究了基体蠕变与界面扩散蠕变两种蠕变机理在总蠕变中发挥的作用,考察了不同加载条件和不同纤维体积分数对复合材料整体蠕变行为的影响.

关键词：金属基复合材料蠕变界面扩散细观力学应力松弛

How to build a habitable planet:an interview with Charles H. Langmuir

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National Science Review 2024年第6期11卷 76-80页

作者： Yi-Gang xu the Guangzhou Institute of Geochemistry Chinese Academy of Sciences

Earth is the only known habitable planet in the solar system. Understanding how Earth developed its unique habitability has been the frontier of Earth sciences and has become one of the main themes of current deep-space explorations. What are the decisive factors that led to a habitable planet? What is the role of solid Earth processes in the origin of life and in modulating the surface environment? Are Earth’s habitability studies relevant to current challenges that human beings face? These questions have attracted the interest of both scientists and the public alike.

关键词： Earth (planet)

Preface for the Special Issue on“Safety and Intelligent Maintenance of Offshore Structures”

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China Ocean Engineering 2024年第2期38卷 181-182页

作者： xu Wan-hai State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China

The ocean serves as a vital carrier for human resource development and economic growth and contains rich mineral resources such as oil,natural gas,polymetallic nodules,cobalt-rich ferromanganese crusts,polymetallic sulfides,and rare earth ***,the ocean has wealthy reserves of wind,wave,tidal,and solar energy,making it an essential strategic space for sustainable future ***,offshore structures are complex.

关键词： ocean offshore tidal

From 0D to 3D:Hierarchical structured high-performance free-standing silicon anodes based on binder-induced topological network architecture

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Journal of Energy Chemistry 2024年第6期93卷 16-23,I0002页

作者： Yihong Tong Ruicheng Cao Guanghui xu Yifeng Xia Hongyuan xu Hong Jin Hui xu Xi’an Jiaotong University Suzhou Academy Suzhou 215123JiangsuChina Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123JiangsuChina

Free-standing silicon anodes with high proportion of active materials have aroused great attention;however,the mechanical stability and electrochemical performance are severely ***,to resolve the appeal issues,a free-standing anode with a"corrugated paper"shape on micro-scale and a topological crosslinking network on the submicron and nano-scale is ***,an integrated three-dimensional electrode structure is constructed based on robust carbon nanotubes network with firmly anchored SiNPs via forming interlocking *** which,the hierarchical interlocking structure is achieved by directional induction of the binder,which ensures well integration during cycling so that significantly enhances mechanical stability as well as electronic and ionic conductivity of *** from it,this anode exhibits outsta nding performance under harsh service conditions including high Si loading,ultrahigh areal capacity(33.2 mA h cm^(-2)),and high/low temperatures(-15-60℃),which significantly extends its practical ***,the optimization mechanism of this electrode is explored to verify the crack-healing and structure-integration maintaining along cycling via a unique self-stabilization ***,from both the fundamental and engineering views,this strategy offers a promising path to produce high-performance free-standing electrodes for flexible device applications especially facing volume effect challenges.

关键词： Topological network Self-stabilization Flexibility Free-standing Silicon anode

Quantifying the strength of magnetic fields using baryon electric charge correlation

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Nuclear Science and Techniques 2024年第8期35卷 5-8页

作者： xu‑Guang Huang Physics Department and Center for Particle Physics and Field Theory Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics National Natural Science Foundation of China and Fudan UniversityShanghai 200438China

Although heavy-ion collisions generate strong magnetic fields,their direct measurement is a challenging task.A new observable,the baryon electric charge correlation,was recently found to be sensitive to the magnetic field strength and thus could be used as a magnetometer for heavy-ion ***,this observable may shed light on the equation of state and phase structure of quantum chromodynamics(QCD)under magnetic *** and understanding the phase structure of quantum chromodynamics(QCD)is important in contemporary physics[1].

关键词： charge observable magnetic

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闽语全浊上声字的地理分布问题

厦大中文学报 2019年第1期 174-183页

作者：许彬彬厦门大学中文系福建厦门361005

根据现有调查资料以及文献材料,古代的全浊声母大部分今读为清音。闽语区是全浊声母今读清音的代表区域,浊音清化以后不论平仄,多数读为不送气,少数送气。因此,判断音读层次的早晚某种程度上可以据此作出一定的区分。全浊上声归去声的... 详细信息

根据现有调查资料以及文献材料,古代的全浊声母大部分今读为清音。闽语区是全浊声母今读清音的代表区域,浊音清化以后不论平仄,多数读为不送气,少数送气。因此,判断音读层次的早晚某种程度上可以据此作出一定的区分。全浊上声归去声的规律在一些发展较快的方言中是显著特征,部分发展较慢的方言还保留阳上调。其中,闽南方言主要通行区域虽是遵循'浊上归去'的规律,却呈现如下类型:声母呈现系统分化、部分分化,声调呈现系统归并,部分归并类型。送气与否与闽语层次关系密切。

关键词：闽语全浊上声分布演变

Improved mass relations of mirror nuclei

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Nuclear Science and Techniques 2024年第9期35卷 178-185页

作者： Cheng xu Man Bao Department of Physics University of Shanghai for Science and TechnologyShanghai 200093China

In this study,we revisit the previous mass relations of mirror nuclei by considering 1/N-and 1/Z-dependent terms and the shell effect across a *** root-mean-squared deviation is 66 keV for 116 nuclei with neutron number N≥10,as com-pared with experimental data compiled in the AME2020 *** predicted mass excesses of 173 proton-rich nuclei,including 98 unknown nuclei,are tabulated in the Supplemental Material herein with competitive accuracy.

关键词： Nuclear mass Mirror nuclei Proton-rich nuclei

居住建筑能效测评方法研究——外围护结构综合热工性能评估方法

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四川建筑科学研究 2009年第4期35卷 234-239页

作者：韦延年徐斌斌于忠四川省建筑科学研究院节能研究所四川成都610081

基于国情,从居住建筑的节能设计及建成后居住者使用采暖空调设备改善室内热环境的用能状况综合分析,提出以建筑自身的节能因素建立的外围护结构综合热工性能评估方法,作为居住建筑能效测评方法。该方法是一个创新,不仅科学、合理、实际... 详细信息

基于国情,从居住建筑的节能设计及建成后居住者使用采暖空调设备改善室内热环境的用能状况综合分析,提出以建筑自身的节能因素建立的外围护结构综合热工性能评估方法,作为居住建筑能效测评方法。该方法是一个创新,不仅科学、合理、实际,而且灵活、可操作性强,也可作为居住建筑节能设计中的综合指标设计方法。

关键词：居住建筑能效测评外围护结构综合热工性能评估方法