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Prediction and mitigation analysis of ground vibration caused by running high-speed trains on rigid-frame viaducts

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Earthquake Engineering and Engineering Vibration 2016年第1期15卷 31-47页

作者： Liangming Sun Weiping Xie Xingwen He Toshiro Hayashikawa School of Civil Engineering and Architecture Wuhan University of Technology Graduate School of Engineering Hokkaido University

In this study a 3D numerical analysis approach is developed to predict the ground vibration around rigid-frame viaducts induced by running high-speed trains. The train-bridge-ground interaction system is divided into two subsystems： the train-bridge interaction and the soil-structure interaction. First, the analytical program to simulate bridge vibration with consideration of train-bridge interaction is developed to obtain the vibration reaction forces at the pier bottoms. The high- speed train is described by a multi-DOFs vibration system and the rigid-frame viaduct is modeled with 3D beam elements. Second, applying these vibration reaction forces as input external excitations, the ground vibration is simulated by using a general-purpose program that includes soil-structure interaction effects. The validity of the analytical procedure is confirmed by comparing analytical and experimental results. The characteristics of high-speed train-induced vibrations, including the location of predominant vibration, are clarified. Based on this information a proposed vibration countermeasure using steel strut and new barrier is found effective in reducing train-induced vibrations and it satisfies environmental vibration requirements. The vibration screening efficiency is evaluated by reduction VAL based on 1/3 octave band spectral analysis.

关键词： ground vibration rigid-frame viaduct train-bridge interaction vibration countermeasure reduction VAL

A Simple Approach to Control the Growth of Non-spherical Gold Nanoparticles

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Chinese Chemical Letters 2003年第11期14卷 1163-1166页

作者： Hong YUAN Ru Xiu CAI Dai Wen PANG College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072

A simple method to prepare the non-spherical gold particles was developed. The result solution included trigonal, truncated trigonal, hexagonal layers, and a pseudo-pentagonal shaped gold nanocrystals. The key factor is to control the relative rates of nucleation and cluster growth in this method. These attributes make seeding growth method as a useful tool in the fabrication of colloidal metal materials. A longitudinal plasmon resonance of 866 nm was observed, which is in the near-IR spectral regions (600-1000 nm). The excellent optical properties as near-IR labels are used to develop highly sensitive analysis method.

关键词： Controlled synthesis shaped nanoparticles gold.

Improvement on Diamond Nucleation Treated by Pulsed Arc Discharge Plasma

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Plasma Science and Technology 2004年第3期6卷 2333-2336页

作者：马志斌万军汪建华张文文 School of Material Science & Technology Wuhan Institute of Chemical Technology Wuhan 430073 China

A technique of improvement on diamond nucleation based on pulsed arc discharge plasma at atmospheric pressure was developed. The pulsed arc discharge was induced respectively by nitrogen, argon and methanol gas. After the arc plasma pretreatment, a nucleation density higher than 1010 cm-2 may be obtained subsequently in chemical vapor deposition (CVD) on a mirror-polished silicon substrate without any other mechanical treatment. The effects of the arc discharge plasma on the diamond nucleation were investigated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR) and Raman spec-troscopy. The enhancement of nucleation is postulated to be a result of the formation of carbon-like phase materials or nitrogenation on the substrate surface without surface defect produced by arc discharge.

关键词： nucleation diamond pulsed arc discharge

Effect of Polymer Matrix on Temperature Sensitivity of Temperature Sensitive Paints

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Chinese Journal of Polymer Science 2015年第10期33卷 1351-1358页

作者： Zhi-dong Wang Xiao-zhong Qu 金毕青 Yi Shi 刘治田金熹高 School of Material Science and Engineering Wuhan Institute of Technology State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

The thermal quenching behaviors of the temperature sensitivity paints （TSP） composed of europium（III） thenoyltrifluoroacetonate （EuTTA） and Eu-phenanthrene complex （Eu-2） in polystyrene （PS）, polymethylmethacrylate （PMMA） and epoxy resin （EP） were investigated. It is found that both the emission intensity and temperature sensitivity were not only affected by the luminescence probes, but also by the polymer matrix. The interaction between probes and matrix results in the alteration of both the non-radiation decay rate and the activation energy of the non-radiative process for the thermal quenching process, i.e. larger activation energy of the non-radiative process shows higher temperature sensitivity and less emission intensity. Therefore, it was confirmed that the temperature sensitivity and luminescent intensity of TSP depended not only on the luminescence probes but also on the polymer matrix.

关键词： Temperature sensitive paints Europium complex Thermal quenching Polymer matrix Temperature sensitivity

Ultra-lightweight ceramic scaffolds with simultaneous improvement of pore interconnectivity and mechanical strength

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Journal of Materials Science & Technology 2023年第6期137卷 247-258页

作者： Ye Dong Annan Chen Ting Yang Shuai Gao Shuning Liu Hongyi Jiang Yusheng Shi Chenglong Hu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The high porosity and interconnectivity of scaffolds are critical for nutrient transmission in bone tis-sue engineering but usually lead to poor mechanical ***,a novel method that combines acid etching(AE)with selective laser sintering(SLS)and reaction bonding(RB)of Al particles is pro-posed to realize highly improved porosity,interconnectivity,mechanical strength,and in vitro bioactivity in 3D Al_(2)O_(3) *** controlling the oxidation and etching behaviors of Al particles,a tunable hol-low spherical feature can be obtained,which brings about the distinction in compressive response and fracture *** prevention of microcrack propagation on the in situ formed hollow spheres results in unique near elastic buckling rather than traditional brittle fracture,allowing an unparalleled compressive strength of 3.72±0.17 MPa at a high porosity of 87.7%±0.4%and pore interconnectivity of 94.7%±0.4%.Furthermore,scaffolds with an optimized pore structure and superhydrophilic surface show excellent cell proliferation and adhesion *** findings offer a promising strategy for the coexistence of out-standing mechanical and biological properties,with great potential for tissue engineering applications.

关键词： Ceramic scaffolds Selective laser sintering Acid etching Hollow spherical feature Mechanical strength In vitro bioactivity

Recent advances in chiral aggregation-induced emission fluorogens

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Engineered Regeneration 2022年第3期3卷 323-338页

作者： Rui Hu Yuncong Yuan Meijia Gu You-Quan Zou Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of EducationSchool of Pharmaceutical SciencesWuhan UniversityWuhanChina College of Life Sciences Wuhan UniversityWuhanChina TaiKang Center for Life and Medical Sciences Wuhan UniversityWuhanChina

Over the past decade,aggregation-induced emission(AIE)molecules have played a pivotal role in bioimaging,anti-microbial,and photodynamic therapy,and have been at the forefront of several disciplines *** combined with chiral moieties,they can easily collide with dazzling sparks and exhibit exceptional and unique *** the application of chiral recognition and measurement of enantiomeric excess,it can identify chi-ral molecules visually based on color change and precipitation reaction,quantitatively analyze chiral molecules while determining the enantiomeric composition based on the fluorescence intensity change at different wave-lengths,and obtain two parameters about chiral molecules from one measurement,thereby demonstrating its high selectivity,sensitivity and accuracy in chiral *** the field of organic circularly polarized lu-minescent(CPL)materials,the asymmetry(g lum)of common organic light emitting elements is usually between 10−5 and 10−2,whereas the CPL asymmetry factor(g lum)of chiral AIE fluorogens(AIEgens)can reach 1.42,which is very close to the theoretical value of ***,the combination of chiral elements and luminescent groups promotes their adoption in the field of organic CPL *** we have summarized the recent applications of chiral AIEgens in both chiral molecule recognition and circularly polarized organic light-emitting diode(CP-OLED)in order to provide future researchers with a more comprehensive and detailed understanding of chiral AIEgens and to encourage more scientists to contribute to the development of AIEgens.

关键词： Aggregation-induced emission Chiral AIE fluorogens Recognition Circularly polarized luminescent

Microwave Sintering of W-15Cu Ultrafine Composite Powder Prepared by Spray Drying & Calcining-continuous Reduction Technology

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Journal of wuhan University of Technology(Materials Science) 2011年第2期26卷 281-284页

作者：舒敬萍 Engineering Training Center Wuhan University of Technology

The effects of microwave sintering and conventional H2 sintering on the microstructure and properties of W-15Cu alloy using ultrafine W-15Cu composite powder fabricated by spray drying ＆ calcining-continuous reduction technology were investigated. In comparison to the conventional HE sintering processing, microwave sintering to W-15Cu can be achieved at lower sintering temperature and shorter sintering time. Furthermore, higher performances in microwave sintered compacts were obtained, but high microwave sintering temperature or long microwave sintering time could result in coarser microstructures.

关键词： W-15Cu ultrafine composite powder spray drying & calcining continuous reduction microwave sintering

Effect of Pre-wetted Light-weight Aggregate on Internal RelativeHumidity and Autogenous Shrinkage of Concrete

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Journal of wuhan University of Technology(Materials Science) 2006年第1期21卷 134-137页

作者：叶家军 School of Material Science and Engineering Wuhan University of Technology Wuhan 430070China

This research indicates that the gradient of internal relative humidity （IRH） decreases rapidly within 7-day curing age in HPC. The amount of water imported by pre-wetted light-weight aggregate can regulate IRH of concrete. By importing a proper amount of water, the process of the decline of IRH can be delayed and the autogenous shrinkage can be reduced. The relationship among the amount of water imported by pre- wetted lightweight aggregate, IRH and AS was established. The result provides a new method of reducing early AS and enhancing early cracking resistance of HPC.

关键词： autogenous shrinkage pre-wetted lightweight aggregate internal relative humidity high performance concrete

Novel chitosan-ethylene glycol hydrogel for the removal of aqueous perfluorooctanoic acid

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Journal of Environmental Sciences 2019年第10期31卷 21-28页

作者： Li Long Xiaolan Hu Jinpeng Yan Yifan Zeng Jiaqi Zhang Yingwen Xue School of Civil Engineering Wuhan University

It is urgent to explore an effective removal method for perfluorooctanoic acid(PFOA)due to its recalcitrant *** this study,a novel chitosan-based hydrogel(CEGH)was prepared with a simple method using chitosan and ethylene glycol through a repeated freezingthawing *** adsorption of PFOA anions to CEGH agreed well to the FreundlichLangmuir model with a maximum adsorption capacity as high as 1275.9 mg/g,which is higher than reported values of most adsorbents for *** adsorption was influenced by experimental *** results showed that the main removal mechanism was the ionic hydrogen bond interaction between carbonyl groups(COO-)of PFOA and protonated amine(NH^+)of the CEGH ***,CEGH is a very attractive adsorbent that can be used to remove PFOA from water in the future.

关键词： PFOA removal Chitosan-based material Hydrogel Adsorption mechanism