PDF HTML XML Export Cite reminder Experimental Study on Long Term Mechanical Performance of External CFRP Reinforced Concrete Box Girders DOI: 10.59238/j.pt.2009.05.003 Author: Affiliation: (Hunan University) Clc Number: TU375.1 Fund Project: Article | Figures | Metrics | Reference | Related | Cited by | Materials | Comments Abstract:Carbon fiber reinforced polymer (CFRP) bars have excellent physical and mechanical properties and can be used to replace traditional prestressed steel bars. A model of prestressed concrete box girder with externally configured carbon fiber reinforcement was made, and experimental observations were conducted for 1001 days on the stress redistribution, long-term deflection deformation, and crack development of the box girder under continuous uniform load. Based on the measured creep coefficient of plain concrete columns, the bilinear method and curvature method were used to predict the long-term bending deformation of the test box beam. The experimental results show that the strain of compressive steel bars increases by 225% to 268% compared to the initial value, the strain of tensile steel bars increases by 36.2% to 38.6% compared to the initial value, and the compressive strain of concrete surface increases by 164% to 224% compared to the initial value. According to the current design specifications, the characteristic crack width under long-term load action is 11.8%~55.5% smaller than the measured value. The measured value of long-term bending deformation in the mid span is 2.32-2.42 times the initial deformation, which is 18.5% larger than the current design specifications Reference Related Cited by
The ferroptosis pathway is recognized as an essential strategy for tumor treatment. However, killing tumor cells in deep tumor regions with ferroptosis agents is still challenging because of distinct size requirements for intratumoral accumulation and deep tumor penetration. Herein, intelligent nanocapsules with size-switchable capability that responds to acid/hyperthermia stimulation to achieve deep tumor ferroptosis are developed. These nanocapsules are constructed using poly(lactic-co-glycolic) acid and Pluronic F127 as carrier materials, with Au-Fe
We reported the rationally designed Ta 3 N 5 @ReS 2 heterojunctions with promoted photocatalytic hydrogen evolution, which is ∼16 times higher than that of the Ta 3 N 5 counterpart, and superior to those of Ta 3 N 5 -based photocatalysts ever reported.
Surface treatment of a glass surface for improving hydrophobicity using the non-thermal plasma generated by a multineedle to-plane electrode arrangement dielectric barrier discharge(DBD)at atmospheric pressure is conducted,and the surface properties of the glass before and after the DBD treatment are studied using contact angle measurement,surface resistance mea-surement and wet flashover voltage tests.The effects of the applied voltage and time duration of these two discharges on the surface modification are studied,and the optimal conditions for the treatment are obtained.It is found that a layer of hydrophobic coating is formed on the glass surface after spraying a thin layer of silicone oil and undergoing the DBD treatment,and the improvement of hydrophobicity depends on DBD voltage and treatment time.It seems that there exists an optimum plasma dose for the surface treatment.It is concluded that-CH 3 and large molecule radicals can react with the radicals in the glass surface to replace-OH,and the hy-drophobicity of the glass surface is improved accordingly.
A conversion-type anode with superior theoretical specific capacity and medium operating voltage is regarded as a potential solution for the next generation of high-performance lithium-ion batteries (LIBs) anode. However, the practical application of a conversion-type anode is hindered by the sluggish conversion reaction kinetics and ambiguous conversion reaction mechanism. Herein, a flexible Co9S8-carbon nanofibers composite foam (Co9S8@CF-700) with unique ganglion-like architecture is ingeniously designed and synthesized through an electrospinning strategy. Tested as an LIBs anode, a carbon nanofibers network with prominent conductivity, highly reversible additional capacity, and excellent buffering capability ensure the enhanced conversion reaction kinetics of flexible Co9S8@CF-700 relative to Co9S8 nanoparticles. Furthermore, a comprehensive high temporal-spatial resolution in situ measurement system combining in situ X-ray diffraction (XRD) and in situ magnetometry techniques is proposed and applied to reveal the adsorption-conversion-space charge/intercalation lithium storage mechanism of Co9S8@CF-700. Specifically, in situ XRD detects the conversion reaction in the medium voltage region, and the in situ magnetometry monitors the capacitive behavior in the high-voltage region and the space charge/intercalation lithium storage behavior in the low-voltage region. This work opens a new avenue for enhancing the lithium storage kinetics and exploring the energy storage mechanism of LIBs conversion-type anode.
Front cover image: In article number 10.1002/cey2.277, Kilogram-scale fabrication of CdS/ZnS 1D/2D heterojunctions under ambient condition was reported. They delivered a significantly enhanced photocatalytic H2 evolution under visible-light irradiation, which was ~10 and ~85 times to those of pristine CdS nanosheets and CdS nanoparticles, respectively. Furthermore, they exhibited robust photocatalytic performance with a demonstratable stability over 58 h.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
In order to simplify experiments,to optimize the reactor design,and to expand the range of the homogeneous dielectric barrier discharge,we developed a dynamic simulation model for multiple pulses homogeneous dielectric barrier discharge(DBD).In this model,an equivalent electrical model in which a voltage controlled current source(VCCS) is used to simulate homogeneous discharge is adopted,and a switch control module is established to control the VCCS to achieve the functions of adjusting of the number of the pulses.The electrical characteristics of the plane-parallel configuration homogeneous DBD in Ne at atmospheric pressure is studied using the model,and the voltage and current waveforms and Lissajous figures under different conditions are obtained.The electrical characteristics of homogeneous DBD at different voltage amplitudes are also experimentally studied,and the simulation results and experimental results are compared.It is shown that the simulated voltage and current waveforms and Lissajous figures are consistent with experimental ones.The dynamic behavior of the discharge parameters,such as gas gap voltage,discharge current,discharge consumed power,and transported charges which can not be measured in the real discharge process can be calculated with the electrical simulation model.From the voltage-current characteristics curves obtained from simulation,it is known that,except the first discharge current pulse which represents the translation from Townsend discharge into glow discharge,the rest discharge current pulse are all glow discharge.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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