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SOIL MOISTURE TENSION OF CULTURE MEDIA WITH 3D PRINTED RESIN STRUCTURES DESIGNED FOR HORIZONTAL GREENING OF BUILDINGS

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AIJ Journal of technology and Design 2024年第74期30卷 263-268页

作者： Tazumi, Azusa Imaeda, Ryosuke Kitagawa, Keisuke Chen, Ye Graduate School of Engineering Nagoya Institute of Technology Japan Tsukuri College Rensselaer Polytechnic Institute School of Architecture

Architectural greening has become so ubiquitous that its limitations tend to be obscured. Roofs and walls are not necessarily as suitable for planting as grounds, and they increase the structural load and drains for buildings. As opposed to the typical greening with soil, sponge, felt, this research examines the potential usage of a culture medium grown upon 3D printed resin structures. The structures maintain the water and plants, while variegating the environment and facilitating the maintenance. The research proposes such a system by evaluating the soil moisture tension for the potential usage of both 3D printed structure and soil. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： 3D printing

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SEISMIC RESPONSE PREDICTION METHOD OF BASE ISOLATION STRUCTURES CONSIDERING COMPLEX EIGENVALUES Proposal of Complex Eigenvalue Estimation Formula and Mode Synthesis Design Method

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2024年第819期89卷 513-524页

作者： Oura, Hanae Hata, Ippei Akuto, Nobuhiro Ito, Aimi Yamagami, Tetsuya Kuo, Chunhuan Dept. of Architecture Graduate School College of Science and Technology Nihon Univ Japan Dept. of Architecture College of Science and Technology Nihon Univ. Japan Ishimoto Architectural & Engineering Firm Inc. Japan

This paper proposes a methodology that can accurately predict the overall response of base-isolated structures by leveraging eigenvalues (natural period, viscous damping constant), participation vectors, and bilinear hysteresis parameters (hysteresis damping constant, bilinear coefficient, ductility factor) derived from complex eigenvalue analysis. This analysis introduces estimating formulas for complex eigenvalues, which can be calculated using data obtained from elastic eigenvalue analysis. As a result, it was found that complex eigenvalues could be estimated with high precision using the proposed estimating equation. Moreover, it was confirmed that the method provides high accuracy in predicting both response displacement and response acceleration. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Acceleration

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Application and structure of carbon nanotube and graphene-based flexible electrode materials and assembly modes of flexible lithium-ion batteries toward different functions

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Frontiers in Energy 2024年第5期18卷 612-639页

作者： Yanzhi Cai Zhongyi Hu Laifei Cheng Siyu Guo Tingting Liu Shaohua Huang Dengpeng Chen Yuhan Wang Haiming Yu Yuan Zhou College of Materials Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Science and Technology on Thermostructure Composite Materials Laboratory Northwestern Polytechnical UniversityXi'an 710072China

In recent years,the rapid development of portable/wearable electronics has created an urgent need for the development of flexible energy storage *** lithium-ion batteries(FLIBs)have emerged as the most attractive and versatile flexible electronic storage devices *** nanotubes(CNTs)are hollow-structured tubular nanomaterials with high electrical conductivity,large specific surface area,and excellent mechanical ***(G)is to some extent comparable to CNTs,because both have unlimited value in flexible ***,a systematic summary of the application of CNT and G in FLIBs electrodes is presented,including different functional applications and services at different ***,the effects of electrode structures,including powder,wire-shaped,and film-shaped structures,on electrochemical properties is *** assembly structures of the FLIBs consisting of CNT and G-based flexible electrodes to realize different functions,including bendability,stretchability,foldability,self-healing,and self-detecting,are systematically *** current challenges and development prospects of flexible CNT and G-based flexible electrodes and corresponding FLIBs are discussed.

关键词： flexible lithium-ion batteries(FLIBs) carbon nanotubes(CNTs) graphene(G) electrode structure function

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Simulation of Underground Reservoir Stability of Pumped Storage Power Station Based on Fluid-Structure Coupling

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Computer Modeling in engineering & Sciences 2024年第5期139卷 1381-1399页

作者： Peng Qiao Shuangshuang Lan Hongbiao Gu Zhengtan Mao Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing100020China College of Transportation Engineering Nanjing Tech UniversityNanjing210000China

Based on global initiatives such as the clean energy transition and the development of renewable energy,the pumped storage power station has become a new and significant way of energy storage and regulation,and its construction environment is more complex than that of a traditional *** particular,the stability of the rock strata in the underground reservoirs is affected by the seepage pressure and rock stress,which presents some challenges in achieving engineering safety and *** the advantages of the numerical simulation method in dealing deal with nonlinear problems in engineering stability,in this study,the stability of the underground reservoir of the Shidangshan(SDS)pumped storage power station was numerically calculated and quantitatively analyzed based on fluid-structure coupling theory,providing an important reference for the safe operation and management of the underground ***,using the COMSOL software,a suitablemechanicalmodel was created in accordance with the geological structure and project characteristics of the underground ***,the characteristics of the stress field,displacement field,and seepage field after excavation of the underground reservoir were simulated in light of the seepage effect of groundwater on the nearby rock of the underground ***,based on the construction specifications and Molar-Coulomb criterion,a thorough evaluation of the stability of the underground reservoir was performed through simulation of the filling and discharge conditions and anti-seepage strengthening *** findings demonstrate that the numerical simulation results have a certain level of reliability and are in accordance with the stress measured in the project *** underground reservoir excavation resulted in a maximum displacement value of the rock mass around the caverns of 3.56 mm in a typical section,and the safety coefficient of the parts,as determined using the Molar-Coulomb criterion,was highe

关键词： Underground reservoir fluid-structure coupling numerical simulation pumped storage power station filling and discharge

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Estimating the Coseismic Displacement of Ground Motions with Fling-Step Effect Based on an Intrinsic Timescale Decomposition Algorithm

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Bulletin of the Seismological Society of America 2025年第2期115卷 416-430页

作者： Geng, Yulong Pu, Wuchuan Xue, Yaohui Kong, Fan School of Civil Engineering and Architecture Wuhan University of Technology Wuhan China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian China College of Civil Engineering Hefei University of Technology Hefei China

Strong ground motions resulting from the fling-step effect often exhibit significant static displacement. However, recorded ground-motion signals may display an unreasonable baseline offset because of contamination by low-frequency (LF) noise. Baseline correction is essential to eliminate this offset while preserving the coseismic displacement com-ponent. Many studies have generalized the two-stage offset model and proposed methods for empirically determining the starting times (t1 and t2 ) of the two stages with different levels of offset. To minimize errors caused by the subjective determination of t1 and t2, this article introduces a novel method for detecting optimal values of t1 and t2 and recovering the coseismic displacement of ground motions. The proposed approach uses an intrinsic timescale-decomposition-based filter to eliminate the LF offset component and introduces a quantitative index to identify the starting time points of the offset. After these time points are determined, the corresponding baseline offset is computed using the two-stage offset model. The effectiveness of this method is validated by com-paring its results with the coseismic displacement data recorded by dense Global Positioning System networks during the 1999 Chi-Chi earthquake and the 2011 Tohoku earthquake. In addition, several existing empirical baseline correction methods are assessed. The results confirm that the proposed method effectively removes the baseline offset and accurately recovers coseismic displacement from strong-motion records. © Seismological Society of America.

关键词： Earthquakes

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Experimental Investigation on Compressive Properties of Fiber Recycled Aggregate Concrete

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Journal of Renewable Materials 2023年第11期11卷 3957-3975页

作者： Guiwu Lin Kaige Liu Yuliang Chen Yunpeng Ji Rui Jiang College of Civil Engineering and Architecture Guangxi University of Science and TechnologyLiuzhou545006China

This paper presents an experimental study to explore the compressive properties of fiber recycled aggregate concrete.A total of 75 specimens with the replacement rate of recycled coarse aggregate and fiber type were conducted under a uniaxial compressive *** failure modes,stress-strain whole curves,peak stress,peak strain,and energy dissipation capacity were systematically observed and *** results indicate that steel fiber has the best modification effect on energy dissipation capacity and the toughness index of recycled concrete,corresponding to the enhancement of 81.75% and 22.90% on *** addition of polyvinyl alcohol fiber can effectively improve the compressive strength and energy dissipation capacity of recycled aggregate concrete by 28.49% and 29.43% on average,*** compressive strength and energy dissipation capacity of recycled aggregate concrete is increased by an average of 16.5% and 24.4% by incorporating carbon *** energy dissipation capacity of recycled aggregate concrete is increased by an average of 13.5% with the incorporation of polypropylene ***,the addition of carbon fiber results in a slight reduction of toughness by 16.97%,and the effect of polyvinyl alcohol fiber on the energy dissipation capacity is ***,with the increase in replacement rate,the compressive strength and the energy dissipation capacity of recycled coarse aggregate concrete with fiber decreased,and toughness first decreased and then ***,based on the analysis of test data,a segment-based stress-strain model of fiber recycled aggregate concrete was proposed,which shows good agreement with the test results.

关键词： Recycled aggregate concrete fiber compressive properties energy dissipation toughness

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Fluoride Ion Adsorption Effect and Adsorption Mechanism of Self-Supported Adsorbent Materials Based on Desulfurization Gypsum-Aluminate Cement

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Journal of Renewable Materials 2023年第12期11卷 4079-4095页

作者： Xuefeng Song Minjuan Sun Juan He Lei Wang College of Materials Science and Engineering Xi’an University of Architecture and TechnologyXi’an710055China

The adsorption method has the advantages of low cost,high efficiency,and environmental friendliness in treating fluorinated wastewater,and the adsorbent material is the *** study combines the inherent anion-exchange adsorption properties of layered double hydroxides(LDHs).Self-supported porous adsorbent materials loaded with AFm and AFt were prepared from a composite cementitious system consisting of calcium aluminate cement(CAC)and flue gas desulfurization gypsum(FGDG)by chemical foaming *** mineral composition of the adsorbent material was characterized by X-ray diffraction(XRD)and Scanning electron microscopy(SEM).Through the static adsorption experiment,the adsorption effect of the mineral composition of the adsorbent on fluoride ions was deeply analyzed,and the adsorption mechanism was *** and SEM showed that the main hydration phases of the composite cementitious system consisting of CAC and FGDG are AFm,AFt,AH_(3),and CaSO_(4)·2H_(2)*** accelerates the hydration process of CAC and inhibits the transformation of AFt to *** AFt content increased,and the AFm content decreased or even disappeared as the amount of FGDG *** adsorption experiment results showed that AFm and AFt in adsorbent materials could significantly enhance the adsorption of fluoride *** adsorption of F^(−)in aqueous solution by PAG tends more towards monolayer adsorption with a theoretical maximum capacity of 108.70 mg/g and is similar to the measured value of 112.77 mg/g.

关键词： Flue gas desulfurization gypsum(FGDG) Calcium aluminate cement(CAC) AFm AFt Fluoride ions adsorption

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Properties of Sustainable High Strength Concrete with Waste Copper Slag

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Journal of Wuhan University of technology(Materials Science) 2023年第4期38卷 815-822页

作者： JAGAN Sivamani KARUPASAMY Narayanan DHARMARAJ R THIYANESWARAN Periyasamy KARTHIKEYAN Selvarajan NAVANEETHAN Kumaravalasu Subramaniam Department of Civil Engineering Sona College of TechnologySalem636005India Department of Civil Engineering KPR Institute of Engineering and TechnologyCoimbatore641407India Kongu School of Architecture Perundurai638060India Department of Civil Engineering Kongu Engineering CollegePerundurai638060India

The present work investigates copper slag as a substitute for river sand in high-strength *** concrete mixtures were manufactured with 10%,30%,50%,70%,and 100%of copper slag to evaluate the mechanical and durability *** experimental results indicate that replacing copper slag above 50%affects the performance characteristics of the concrete due to its high angularity and lower water absorption *** strength of concrete with 50%copper slag is improved by 5.6%,whereas the strength of concrete with 100%copper slag is reduced by 2.75%at 28 ***,increased curing to 90days improves the strength of the former by 7.16%and reduces the latter by only 0.23%.The water absorption,porosity,and rapid chloride penetration of the concrete mixtures with 100%copper slag are increased by 10.44%,13.20%,and 19.56%compared to control ***-structural investigations through SEM infer higher replacement of copper results in higher void formation due to its reduced water absorption.

关键词： copper slag high strength concrete strength water absorption porosity

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Evaluation of transmission risk of respiratory particles under different ventilation strategies in an elevator

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Building Simulation 2024年第5期17卷 771-784页

作者： Liangyu Zhu Xian Li Bujin Feng Fan Liu School of Civil Engineering and Architecture Linyi UniversityLinyi276000China College of Agriculture Shandong Agricultural UniversityTaian271018China School of Environment and Architecture University of Shanghai for Science and TechnologyShanghai200093China

People in elevators are at risk of respiratory infection because the elevator cabin is crowded and has poor *** exhaled particles may be inhaled by the susceptible person,deposited on the surface and suspended in the elevator,which can result in direct and indirect ***,whether the air vent designs adopted in the elevator can effectively reduce the transmission risk of respiratory particles remains *** this study,the dispersion of particles under four common ventilation strategies used in the commercial elevator was investigated by proven computational fluid dynamics(CFD)*** flow field was simulated with the RNG κ-ξ turbulence model and the Lagrangian method was adopted to track particle *** effects of air vent layout and airflow rate on particle transmission were *** found that more than 50% of exhaled particles(average value)were suspended in the cabin and difficult to discharge under the investigated ventilation *** deposited fraction of particles on the susceptible person reached up to 39.14% for infiltration ventilation,which led to a high risk of contact *** the ventilation rate could not significantly reduce the inhalation proportion of particles due to the poor airflow distribution inside the elevator.A more proper ventilation strategy should be explored for the elevator to control transmission risk.

关键词： particle dispersion transmission risk elevator ventilation strategy computational fluid dynamics(CFD)

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Enhancing electrochemical performance of ultrasmall Fe_(2)O_(3)-embedded carbon nanotubes via combusting-induced high-valence dopants

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Journal of Materials Science & technology 2023年第3期134卷 142-150页

作者： Yuan Wang Tao Zhang Jianfei Xiao Xiaobao Tian Shaojun Yuan Low-carbon Technology and Chemical Reaction Engineering Lab College of Chemical EngineeringSichuan UniversityChengdu 610065China College of Architecture and Environment Sichuan UniversityChengdu 610065China

Doping is a reasonable solution to improve the electronic structure and surface properties of ***,we propose a rapid and simple methodology,flame synthesis,as an effective preparation strategy for incorporating high-valence metal ions(Ti^(4+),Sn^(4+),and Zr^(4+))into ultrasmall Fe_(2)O_(3)on carbon nanotube support(i.e.,M-FeO-CNT).The resulting materials exhibit not only a boosted Na+adsorption as shown by density functional theory(DFT)calculations,but also display an increased oxygen *** electrochemical activity and charge transfer efficiency of Fe 2 O 3 can be improved by reasonably sub-stituting Fe 3+with Ti^(4+),Sn^(4+),and Zr^(4+).The electrochemical investigation of Ti-doped Fe 2 O 3(Ti-FeO-CNT)electrode demonstrates a splendid specific capacitance of 1.25 F cm^(−2)at 1 mA cm^(−2)in 1 M Na_(2)SO_(4).This is significantly higher as compared to the capacitance of 0.48 F cm^(−2).Flexible solid-state asymmetric su-percapacitor Ti-FeO-CNT//MnO_(2)is verified with operating voltage of 2.0 V and stability over 3000 cycles,and delivers a high energy density of 2.14 mWh cm^(−3)at power density of 25 mW cm−*** flame synthesis is expected to be widely applicable for the preparation of high-valence metal ions doped nanosized Fe_(2)O_(3)functionalized materials,thus opening up new avenues for energy and catalysis research.

关键词： Ultrasmall Fe_(2)O_(3)nanoparticles Doping Flame synthesis Flexible supercapacitor DFT calculations

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