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Experimental study on flexural behavior of ECC/RC composite beams with U-shaped ECO permanent formwork

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1271-1287页

作者： zhi qiao Zuanfeng PAN Weichen XUE Shaoping MENG Key Laboratory of Concrete & Prestressed Concrete Structures of the Ministry of Education Southeast UniversityNanjing 210096China College of Civil Engineering Tongji UniversityShanghai 200092China School of Civil Engineering Southeast UniversityNanjing 210096China

To enhance the durability of a reinforced concrete structure, engineered cementitious composite (ECC), which exhibits high tensile ductility and good crack control ability, is considered a promising alternative to conventional concrete. However, broad application of ECC is hindered by its high cost. This paper presents a new means to address this issue by introducing a composite beam with a U-shaped ECC permanent formwork and infill concrete. The flexural performance of the ECC/RC composite beam has been investigated experimentally with eight specimens. According to the test results, the failure of a composite beam with a U-shaped ECC formwork is initiated by the crushing of compressive concrete rather than debonding, even if the surface between the ECC and the concrete is smooth as-finished. Under the same reinforcement configurations, ECC/RC composite beams exhibit increases in flexural performance in terms of ductility, load-carrying capacity, and damage tolerance compared with the counterpart ordinary RC beam. Furthermore, a theoretical model based on the strip method is proposed to predict the moment-curvature responses of ECC/RC composite beams, and a simplified method based on the equivalent rectangular stress distribution approach has also evolved. The theoretical results are found to be in good agreement with the test data.

关键词： engineered cementitious composite (ECC) durability ECC/RC composite beam permanent formwork flexural performance theoretical method

Alice-Bob Peakon Systems

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Chinese Physics Letters 2017年第6期34卷 1-4页

作者： Sen-Yue Lou zhi-Jun qiao Center for Nonlinear Science and Department of Physics Ningbo University Ningbo 315211 Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai 200062 School of Mathematical and Statistical Science University of Texas TX 78539 USA

We study the Alice-Bob peakon system generated from an integrable peakon system using the strategy of the so- called Alice-Bob non-local KdV approach [Scientific Reports 7 （2017） 869]. Nonlocal integrable peakon equ... 详细信息

关键词： ABP Alice-Bob Peakon Systems

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Model-based risk assessment on dynamic control of twin-column continuous capture under feedstock variations

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Chinese Journal of Chemical Engineering 2024年第10期74卷 22-30页

作者： Yu Fan Liang-zhi qiao Shan-Jing Yao Dong-Qiang Lin Key Laboratory of Biomass Chemical Engineering of Ministry of Education Zhejiang Key Laboratory of Smart BiomaterialsCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310058China

Dynamic control is essential to guarantee the stable performance of continuous *** dynamic control strategy has been developed to ensure a consistent protein load in twincolumn CaptureSMB continuous capture by integrating the UV signal of *** this study,the process risk of CaptureSMB continuous capture under AutoMAb control towards the feedstock variations was assessed by a mechanistic model developed by *** effects of target protein and impurities under the variation range of±10 mAU·min^(-1) on load amount,protein loss,process productivity,and resin capacity utilization were *** results showed that the CaptureSMB process could be successfully controlled by AutoMAb towards increased or slightly decreased concentration of ***,the load process would be out of control with drastically decreased target protein or impurities,and the decreased impurities would lead to protein *** was found that AutoMAb control would cause 44.7%non-operational areas and 18.3%protein loss areas in the variation range of±10 mAU·min^(-1).To improve the stability of the CaptureSMB process,a modified AutoMAb control that would stop the load procedure when the absolute value of the integral area reached the preset value,was proposed to reduce the risk of protein loss and the non-operational area.

关键词： Continuous chromatography Process control Feedstock variations Mechanistic modeling Purification

A Unisonant r-Matrix Structure of Integrable Systems and Its Reductions

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Chinese Physics Letters 2000年第4期17卷 235-237页

作者： qiao zhi-Jun Walter STRAMPP Institute of Mathematics Fudan UniversityShanghai 200433 Fachbereich 17 Mathematikj Universitat-GH KasselD-34109 KasselGermany

A new method is presented to generate finite dimensional integrable *** starting point is a generalized Lax matrix instead of usual Lax *** a unisonant r-matrix structure and a set of generalized Hamiltonian functions are *** can be clearly seen that various constrained integrable Hows by nonlinearization method,such as the c-AKNS,c-MKdV,c~Toda,etc.,are derived from the reduction of this ***,some new integrable Hows are produced.

关键词： structure integrable matrix

Correlation between Primary and Secondary Recrystallization Texture Components in Low-temperature Reheated Grain-oriented Silicon Steel

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Journal of Iron and Steel Research International 2016年第11期23卷 1234-1242页

作者： Gong-tao LIU zhi-qiao LIU Ping YANG Wei-min MAO School of Materials Science and Engineering University of Science and Technology Beijing

Low-temperature slab-reheated grain-oriented silicon steel is characterized by a sharp {411}〈148〉 primary recrystallization texture. To date, the influence of this texture on secondary recrystallization is not clear. Microtextures in primary and secondary reerystallized sheets of low-temperature reheated grain-oriented silicon steel were examined using electron backscatter diffraction. By comparing the textures and microstructures of specific primary reerystallized grains neighboring secondary grains with those of other primary grains, the influences of primary re- crystallization textures and microstructures on the orientations of secondary grains were investigated. Results show that for low-temperature reheated graiworiented silicon steel, the primary recrystallization sheet comprises { 411 } 〈148〉, {111}〈112〉, and {001}〈120〉 texture componems. During secondary recrystallization, the {111}〈112〉 primary recrystallized grains were easily consumed by abnormally grown Goss, deviated Goss, Brass, or {210}〈001〉grains ;the { 411 }〈148〉 primary recrystallized grains were more resistant to being swallowed; and the {001} 〈120 grains were the most resistant to being consumed. For a particular primary grain, the distribution of its surrounding grain boundaries determined how easily it is consumed during secondary recrystallization. Primary grains surrounded by 20°- 45° grain boundaries were consumed much earlier than those having grain boundaries above 45°, which is in accordance with high-energy grain boundary theory. In addition, special ∑9 boundaries between {411}〈148〉 and Goss grains move more slowly than ∑9 boundaries between {111 }〈112〉 and Goss grains, which is attributed to the different positions of 〈110〉 rotation axis with respect to the normals of grain boundaries.

关键词： grain-oriented silicon steel secondary recrystallization texture low-temperature slab reheating

The pathological role of ferroptosis in ischemia/reperfusion-related injury

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Zoological Research 2020年第3期41卷 220-230页

作者： Hong-Fa Yan Qing-Zhang Tuo qiao-zhi Yin Peng Lei Department of Neurology and State Key Laboratory of Biotherapy West China HospitalSichuan Universityand Collaborative Center for BiotherapyChengduSichuan 610041China Chengdu University of Traditional Chinese Medicine ChengduSichuan 610041China

Ischemia/reperfusion(I/R) is a pathological process that occurs in numerous organs throughout the human body, and it is frequently associated with severe cellular damage and death. Recently it has emerged that ferroptosis, a new form of regulated cell death that is caused by iron-dependent lipid peroxidation, plays a significantly detrimental role in many I/R models. In this review, we aim to revise the pathological process of I/R and then explore the molecular pathogenesis of ferroptosis. Furthermore,we aim to evaluate the role that ferroptosis plays in I/R, providing evidence to support the targeting of ferroptosis in the I/R pathway may present as a therapeutic intervention to alleviate ischemia/reperfusion injury(IRI) associated cell damage and death.

关键词： Ischemia/reperfusion Ferroptosis Reactive oxygen species Lipid peroxidation Iron

Morphologies of ZnO Nanorods

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Chinese Physics Letters 2001年第11期18卷 1527-1528页

作者： LI Jian-Ye CHEN Xiao-Long WEI zhi-Feng qiao zhi-Yu Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Department of Physical Chemistry University of Science and Technology BeijingBeijing 100083

ZnO nanorods with different morphologies were fabricated through a simple reaction method. They were characterized by means of powder x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ener-gy-dispersive x-ray (EDX) spectroscopy. FE-SEM images have shown that the shapes of the ZnO nanorods included straight nanorods, spear-like nanorods with sawtooth-shaped surfaces and lotus root-like nanorods. XRD and EDX indicated that all the nanorods are composed of hexagonal ZnO.

关键词： spectroscopy. nanorods method.

Infrared nanoimaging of nanoscale sliding dislocation of collagen fibrils

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Nano Research 2022年第3期15卷 2355-2361页

作者： zhi qiao Mengfei Xue Yongqian Zhao Yindong Huang Ming Zhang Chao Chang Jianing Chen Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic Science and EngineeringXi'an Jiaotong UniversityXi’an 710049China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Neurobiology Collaborative Innovation Center for Brain Science and Shaanxi Key Laboratory of Brain DisordersSchool of Basic MedicineFourth Military Medical UniversityXi’an 710032China Songshan Lake Materials Laboratory Dongguan 523808China

Collagen,one of the major components in the mammalian connective tissues,plays an essential role in many vital physiological *** common diseases,such as fibrosis,overuse injuries,and bone fracture,are associated with collagen arrangement ***,the underlying mechanism of collagen arrangement defects remains *** this study,we applied infrared scattering-type scanning near-field optical microscopy to study collagen fibrils’structural ***,we observed two types of collagen fibrils’arrangement with different periodic characteristics.A crystal sliding model was employed to explain this observation *** results suggest that the collagen dislocation propagates in collagen fibrils,which may shed light on many collagen diseases’*** findings help to understand the regulation mechanism of hierarchical biological structure.

关键词： scattering near-field optical microscopy collagen fibrils dislocation D periodicity

Tuning single-phase medium-entropy oxides derived from nanoporous NiCuCoMn alloy as a highly stable anode for Li-ion batteries

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Rare Metals 2023年第9期42卷 2982-2992页

作者： Zhen-Yang Yu Qi Sun Hao Li zhi-Jun qiao Wei-Jie Li Shu-Lei Chou zhi-Jia Zhang Yong Jiang School of Mechanical Engineering Tiangong UniversityTianjin300387China State Key Laboratory for Powder Metallurgy Central South UniversityChangsha410083China School of Material Science and Engineering Tiangong UniversityTianjin300387China School of Electronic and Information Engineering Institute of Quantum Materials and DevicesTiangong UniversityTianjin300387China

Incorporating four cations into a single-phase oxide is beneficial for maintaining structural stability during Li+insertion/desertion because of the produced entropy-dominated phase stabilization effects. However,medium-entropy oxides exhibit inherently poor electron and ion conductivity. As such, in this work, a single-phase medium-entropy oxide of Ni_(x)Cu_(y)CozMn_(1-x-y-z)O(named as NCCM@oxides(H_(2))) is prepared by modified-NiCuCoMn alloy through the epitaxial-growing-based self-combustion and hydrogen reduction. During hydrogen reduction, some Cu ions are reduced to elemental Cu(defined as Cu^(0)),which is distributed among the metal oxides, while generating extensive oxygen vacancies around Cu. The synergetic effect between nanoporous metal-core oxide-shell structure and enriched oxygen/Cu^(0) vacancies greatly enhances the electronic/ionic conductivity. In addition, the lattice of single-phase quaternary metal oxides has the configuration entropy stability, which enables the rock-salt structure to remain stable during repeated conversion reactions. Benefiting from the above-mentioned merits, the anodeforLi-ionbatterieswithentropy-stabled NCCM@oxides(H_(2)) composite shows a high specific capacity of 699 mAh·g^(-1) at 0.1 A·g^(-1) and ultra-stable cycling stability, which maintains 618 and 489 mAh·g^(-1) at 0.1 and 1.0 A·g^(-1) after 200 cycles, respectively. This is the first use of this novel and simple strategy for modifying medium-entropy oxides, which paves the way for the development of high-entropy oxides as high-performance electrodes.

关键词： NiCuCoMn alloy Medium-entropy oxides Li-ion batteries Ultrahigh stability Mechanism