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Lu B.,Tianjin University | Lu B.,Shanghai Municipal Engineering Design Institute | Ji M.,Tianjin University
Plasma Chemistry and Plasma Processing | Year: 2012

Plasma oxidation of ethanethiol in air was investigated using three plasma regimes: surface dielectric pulsed corona discharge, surface dielectric barrier discharge and pulsed corona discharge (PCD) in the plasma reactor. Catalytic plasma degradation of ethanethiol was also performed on the singular or binary metals doped γ-Al2O3. The ethanethiol removal rate increased with increasing energy density but energy efficiency was first increased and then decreased with increasing energy density under three various types of discharges. PCD plasma required the lowest energy density at the similar ethanethiol removal performance compared with the other two plasma discharges. The main intermediate by-products of ethanethiol oxidation by plasma are CH3CHO, HCHO, CO and CO2. The sum of these intermediate products selectivities is 19-43 %, implying that some other intermediates containing carbon were undetermined. When using PCD plasma combined with catalysts, ethanethiol removal rate and energy efficiency were all evidently improved. The maximum energy efficiency was achieved about 200 g kWh-1 using Fe-Mn/γ-Al2O3 assisted PCD plasma, which was about 4.4 times when using PCD plasma alone. The mechanism of ethanethiol oxidation is also discussed. © Springer Science+Business Media, LLC 2012. Source

Qian Z.,Nanjing Southeast University | Chen L.,Nanjing Southeast University | Wang Y.,Nanjing Southeast University | Shen J.,Nanjing Southeast University | Shen J.,Shanghai Municipal Engineering Design Institute
Journal Wuhan University of Technology, Materials Science Edition | Year: 2012

In order to understand the strength developing law of the epoxy asphalt mixture, a curing reaction model of the epoxy asphalt binder was proposed based upon the thermokinetic analysis. Given some assumptions, the model was developed by applying the Kissinger law as well as Arrhenius equation, and the differential scanning calorimetry was performed for estimating the model parameters. To monitor the strength development of the epoxy asphalt mixture, a strength test program was employed and then results were compared to those produced from the proposed model. The comparative evaluation shows that a good consistency exists between the outputs from test program and the proposed model, indicating that the proposed model can be used effectively for simulating the curing reaction process for the epoxy asphalt binder and predicting the strength development for the epoxy asphalt mixture. © 2012 Wuhan University of Technology and Springer-Verlag Berlin Heidelberg. Source

Lu B.,Tsinghua University | Lu B.,Shanghai Municipal Engineering Design Institute | Ma X.,Tsinghua University | Pan C.,Tsinghua University | Zhu Y.,Tsinghua University
Applied Catalysis A: General | Year: 2012

In situ hybridization of carbon with BiPO 4 films were performed through calcination of amorphous complex precursor films on the Ti substrate under various temperatures. The BiPO 4 crystallites were in situ grown into BiPO 4 particles on the surface of the Ti substrate. The formed BiPO 4 particles in situ hybridized with the residual carbon from precursor calcination to form carbon hybridized BiPO 4 films. The extent of hybridization depended on the calcination temperatures. The photocatalytic activities of carbon hybridized BiPO 4 films under different calcination temperatures were estimated through photocatalytic degradation of methylene blue. The results indicated that the film prepared at 400 °C presented the highest photocatalytic activity, which was about 1.5 times than that of the film at 550 °C. This phenomenon could be attributed to the higher carbon hybridization extent, higher transfer efficiency of photo-induced electrons between carbon and BiPO 4 crystalline nanoparticles in films, and corresponding separation efficiency of photo-induced electrons and holes. The electronic interaction was also systematically investigated by the photoelectrochemical measurements. © 2012 Elsevier B.V. Source

Lu B.,Shanghai Municipal Engineering Design Institute
Chinese Journal of Environmental Engineering | Year: 2015

Oxidation of acetaldehyde in water was investigated using ozone produced by dielectric barrier discharge. Ozone was produced using dielectric barrier discharge plasmas in pure oxygen. Ozonation of acetaldehyde was carried out after transferring ozone into the water solutions containing acetaldehyde. It was found that acetaldehyde was oxidized into CO and CO2. The selectivity of CO2 was in range of 66%-80%. The ozonation reaction of acetaldehyde presented a first-order reaction of ozone concentration and a first-order reaction of acetaldehyde concentration. The energy efficiency decreased with increasing injected energy density. It was also suggested that the recycle of unreacted ozone into the solution containing acetaldehyde could contribute to reducing the operating cost for wastewater treatment using ozone. © 2015, Science Press. All right reserved. Source

Li J.,Tongji University | Xiang N.,Tongji University | Tang H.,Shanghai Municipal Engineering Design Institute | Guan Z.,Tongji University
Soil Dynamics and Earthquake Engineering | Year: 2016

Damage investigation of small to medium-span highway bridges in Wenchuan earthquake revealed that typical damage of these bridges included: sliding between laminated-rubber bearings and bridge girders, concrete shear keys failure, excessive girder displacements and even span collapse. However, the bearing sliding could actually act as a seismic isolation for piers, and hence, damage to piers for these bridges was minor during the earthquake. Based on this concept, an innovative solation system for highway bridges with laminated-rubber bearings is developed. The system is comprised of typical laminated-rubber bearings and steel dampers. Bearing sliding is allowed during an earthquake to limit the seismic forces transmitting to piers, and steel dampers are applied to restrict the bearing displacements through hysteretic energy dissipation. As a major part of this research, a quarter-scale, two-span bridge model was constructed and tested on the shake tables to evaluate the performance of this isolation system. The bridge model was subjected to a Northridge and an artificial ground motion in transverse direction. Moreover, numerical analyses were conducted to investigate the seismic performance of the bridge model. Besides the test bridge model, a benchmark model with the superstructure fixed to the substructure in transverse direction was also included in the numerical analyses. Both the experimental and the numerical results showed high effectiveness of this proposed isolation system in the bridge model. The system was found to effectively control the pier-girder relative displacements, and simultaneously, protect the piers from severe damage. Numerical analyses also validated that the existing finite element methods are adequate to estimate the seismic response of bridges with this isolation system. © 2016 Elsevier Ltd. Source

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