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Shake table testing of a multi-tower connected hybrid structure

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 47-59页

作者： Zhou Ying lu Xilin lu Wensheng He Zhijun State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Architectural Design and Research Institute Tongii University Shanghai 200092 China

Many single-tower reinforced concrete core wall-steel frame （RCC-SF） buildings have been built in China, but there are no buildings of different-height multi-tower hybrid system. A multi-tower RCC-SF tall building was thus studied because of its structural complexity and irregularity. First, a 1/15 scaled model structure was designed and tested on the shake table under minor, moderate, and major earthquake levels. Then, the dynamic responses of the model structure were interpreted to those of the prototype structure according to the similitude theory. Experimental results demonstrate that, despite the complexity of the structure, the lateral deformation bends as the ＂bending type＂ and the RC core walls contribute more than the steel frames to resist seismic loads. The maximum inter-story drift of the complex building under minor earthquakes is slightly beyond the elastic limitation specified in the Chinese code, and meets code requirements under major earthquakes. From the test results some suggestions are provided that could contribute favorable effect on the seismic behavior and the displacement of the building.

关键词： complex building hybrid structure scaled model shake table testing seismic performance

A critical Trudinger-Moser inequality involving a degenerate potential and nonlinear Schrodinger equations

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Science China Mathematics 2021年第7期64卷 1391-1410页

作者： lu Chen Guozhen lu Maochun Zhu School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China Department of Mathematics University of ConnecticutStorrsCT 06269USA School of Mathematical Sciences Institute of Applied System AnalysisJiangsu UniversityZhenjiang 212013China

The classical critical Trudinger-Moser inequality in R^(2)under the constraint∫_(R_(2))(|▽u|^(2)+|u|^(2))dx≤1 was established through the technique of blow-up analysis or the rearrangement-free argument:for anyτ>0,it holds that sup u∈H^(1)(r^(2)fR^(2)(τ|U|^(2)+|▽u|^(2)dx≤1∫_(R^(2)(E^4π|u|^(2)-1)dx≤C(τ)lutions to the following Sciridinger equations with critical exponeitial growth:-Δu+V(x)u=f u)in R^(2),(0.1)where V(x)≥0 and vanishes on an open set of R^(2)and f has critical exponential *** a positive constant lower bound for the potential V(x)(e.g.,the Rabinowitz type potential)has been the standard assumption when one deals with the existence of solutions to the above Schrodinger equations when the nonlinear term has the exponential *** existence result seems to be the first one without this standard assumption.

关键词： Trudinger-Moser inequalities degenerate potential ground state solutions Schrodinger equations Nehari manifold

Surface Nanocrystallization (SNC) of Metallic Materials-Presentation of the Concept behind a New Approach

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Journal of Materials Science & Technology 1999年第3期15卷 193-197页

作者： lu, K lu, J Chinese Acad Sci Met Res Inst State Key Lab RSA Shenyang 110015 Peoples R China Univ Technol Troyes LASMIS F-10000 Troyes France

In this paper, a concept of surface nanocrystallization (SNC) of metallic materials is introduced. Three types of SNC processes are classified. Different SNC mechanisms and possible techniques for SNC are discussed with emphasis on mechanically induced surface self-nanocrystallization. Further development and prospects are addressed with respect to the properties and behaviors of the materials with a nanocrystalline surface. Enhancement of the behavior of the engineering materials by means of the SNC technology and its industrial application possibilities are analyzed.

关键词： SNC of Metallic Materials-Presentation of the Concept behind a New Approach Figure

Iron-based biochar as efficient persulfate activation catalyst for emerging pollutants removal:A review

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Chinese Chemical Letters 2023年第11期34卷 74-81页

作者： Jinjie lu Qinwei lu lu Di Yi Zhou Yanbo Zhou State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process East China University of Science and TechnologyShanghai 200237China School of Carbon Neutrality Future Technology East China University of Science and TechnologyShanghai 200237China

In recent years,biochar(BC)as a low-cost,easily available biomass product,is widely applied in sulfate radical-based advanced oxidation processes(SR-AOPs)for emerging pollutants ***,a state-of-art review of iron-based biochar catalysts is currently available in SR-AOPs application.A general summary of the development of biochar and the catalytic properties of biochar is ***,the synthetic strategies of different types of iron-based biochar catalysts are ***,the theoretical calculation to interpret the interaction between biochar and iron species is discussed to explore the activation *** the regeneration methods of biochar-based catalyst are *** unresolved challenges of the existent biochar-based SR-AOPs are pointed out,and the outlooks of future research directions are proposed.

关键词： Biochar Persulfate Emerging pollutants

Surface Properties and Hydrogen Bonds of Mono-functional Polybenzoxazines with Different N-substituents

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Chinese Journal of Polymer Science 2016年第8期34卷 919-919,920-932页

作者： Juan Liu Xin lu 辛忠 Chang-lu Zhou School of Chemical Engineering East China University of Science and Technology

A series of mono-functional benzoxazine monomers with different N-substituents were synthesized from phenol, formaldehyde, and various amines （ammonia, methylamine, n-butylamine, dodecylamine）, named P-am, P-m, P-b, and P-da, respectively. The surface properties of these polybenzoxazine films were proven by contact angle measurements. The hydrogen bond network of the polybenzoxazine systems was studied using the FTIR spectra. And the results showed that the surface free energy increased with increasing the fraction of intermolecular hydrogen bonding when the N-substituent was an alkyl chain. However, the rule was not suitable when the N-substituent was H. That was because there was one more kind of intramolecular hydrogen bond in the poly（P-am）. Based on these findings, we proposed that both the N-substituent alkyl group and the fraction of intermolecular hydrogen bonding had effects on the surface free energy.

关键词： Polybenzoxazine Mono-functional N-substituents Surface free energy Hydrogen bonding.

Durable superamphiphobic silica aerogel surfaces for the culture of 3D cellular spheroids

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National Science Review 2019年第6期6卷 1255-1265页

作者： Lianyi Xu Shuangshuang Chen Xuemin lu Qinghua lu School of Materials Science Institute of Energy Equipment Materials Shanghai Dianji University School of Chemical Science and Engineering Tongji University School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong University

The 3D multicellular spheroids with intact cell–cell junctions have major roles in biological research by virtue of their unique advantage of mimicking the cellular physiological environments. In this work, a durable superamphiphobic silica aerogel surface(SSAS) has been fabricated for the upward culture of 3D multicellular spheroids. Poly(3,4-ethylenedioxythiophene)(PEDOT) was first electrodeposited on a conductive steel mesh as a first template for porous silica coating. Soot particles were then applied as a second template to construct a cauliflower-like silica aerogel nanostructure. After fluorination, a hierarchical structure with re-entrant curvature was finally fabricated as a durable superamphiphobic surface. This superamphiphobic surface also presented excellent antifouling towards biomacromolecules and cells, which has been demonstrated by the successful upward culture of cell spheroids. The upward culture makes the observation of cellular behavior in situ possible, holding great potential for 3D cellular evaluation in vitro.

关键词： cell spheroids superamphiphobicity durability electrochemistry silica aerogel

Analytical solutions for the interfacial viscous capillary-gravity waves due to an oscillating Stokeslet

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Journal of Hydrodynamics 2019年第6期31卷 1139-1147页

作者： Dong-qiang lu Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai 200072China

The fundamental solutions of the Stokes/Oseen equations due to a point force in an unbounded viscous fluid are referred to as the Stokeslet/Oseenlet,for which a systematic derivation are analytically presented here in terms of a uniform *** means of integral transforms,the closed-form solutions are explicitly deduced in a formula which involves the Hamiltonian,Hessian,and Laplacian operators,and elementary ***,interfacial viscous capillary-gravity waves between two semi-infinite fluids due to oscillating singularities,including a simple source in the upper inviscid fluid and a Stokeslet in the low viscous fluid,were analytically studied by the Laplace-Fourier integral transform and asymptotic *** dynamics responses consist of the transient and steady-state components,which are dealt with by the method of stationary phase and the Cauchy residue theorem,*** transient response is made up of one short capillarity・dominated and one long gravity-dominated wave with the former riding on the *** steady-state wave has the same frequency as that of oscillating *** solutions for the wave profiles and the exact solution for the wave number are analytically derived,which show the combined effects of fluid viscosity,surface capillarity and an upper layer fluid.

关键词： Interfacial wave surface tension viscosity Stokeslet asymptotic solution singularity method

On the initial values of kinematic and dynamic free-surface boundary conditions for water wave problems

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Journal of Hydrodynamics 2020年第5期32卷 1024-1027页

作者： Dong-qiang lu Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China

The kinematic and dynamic boundary conditions on the free surface of a fluid should be posed for water wave *** the framework of potential theory for an inviscid and incompressible fluid with an irrotational motion,the combined boundary condition,which involves the velocity potential only,is often used by eliminating the elevation terms *** a combination is correct for the solutions in the frequency domain,and is not feasible for an initial-boundary-value problem in the time domain since it leads to a totally different physical *** correct initial conditions for pure gravity waves and hydroelastic waves are presented.

关键词： Initial values boundary conditions water wave hydroelasticity

New Chromone Glycosides from Hypericum Japonicum

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Chinese Chemical Letters 1997年第1期8卷 41-42页

作者： Wu, QL Liao, YH Wang, SP Wang, LW Feng, yx Yang, JS Xiao, PG Hong, SL BEIJING UNION MED COLL BEIJING 100094PEOPLES R CHINA BEIJING INST MICROCHEM BEIJING 100091PEOPLES R CHINA CHINESE ACAD MED SCI INST MED PLANT DEVBEIJING 100094PEOPLES R CHINA

From the aerial part of Hypericum japonicum Thunb. ex Murray, two new chromone glycosides, 5, 7-Dihydroxy-2-(1-methylpropyl) chromone-8-beta-D-glucoside and 5, 7-Dihydroxy-2-isopropylchromone-8-beta-D-glucoside, were ... 详细信息

关键词： ppm New Chromone Glycosides from Hypericum Japonicum