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Comparative analysis biochar and compost-induced degradation of di-(2-ethylhexyl) phthalate in soils
He, Lizhi,Fan, Shiliang,Mü,ller, Karin,Wang, Hailong,Che, Lei,Xu, Song,Song, Zhaoliang,Yuan, Guodong,Rinklebe, Jö,rg,Tsang, Daniel C.W.,Ok, Yong Sik,Bolan, Nanthi S. Elsevier 2018 Science of the Total Environment Vol.625 No.-
<P><B>Abstract</B></P> <P>In recent years, biochar has been extensively studied as a sorbent for immobilizing contaminants and minimizing their bioavailability in soils. Few studies have been conducted to evaluate the interactions between biochar and compost in soils and their impact on degradation of organic contaminants. In the present study, soils with high organic carbon content (HOC) and low organic carbon content (LOC) were spiked with 100mg·kg<SUP>−1</SUP> di-(2-ethylhexyl) phthalate (DEHP) amended with biochar derived from dead pigs, bamboo, and composted sheep manure. The soils were thereafter incubated for 112days at 25°C and periodically sampled for monitoring DEHP concentrations. Degradation of DEHP was described by a logistic model. Results showed that the initial degradation rates were slow, but accelerated after 14days of incubation. The DEHP degradation rates were higher in the HOC soils than in the LOC soils over the incubation period. The half-lives of DEHP were shorter in the LOC soils treated with pig biochar, and bamboo/pig biochar plus compost than in the untreated soil. However, there was no significant difference in the half-lives of DEHP in the HOC control and treated soils. The differential effects of soil amendments on DEHP degradation between LOC and HOC soils could be explained by the properties of the organic amendments, soil pH and the organic carbon contents of the soils.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Di-(2-ethylhexyl) phthalate (DEHP) degraded faster in high organic matter soil. </LI> <LI> DEHP half-life declined in low organic matter soil amended with biochar and compost. </LI> <LI> Biochar had no effect on DEHP half-life in high organic matter soil. </LI> <LI> DEHP degradation accelerated after 2weeks incubation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Integrated multifunctional power converter for small electric vehicles
Cheng, He,Wang, Wuhui,Liu, Hailong,Yang, Shiyang The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.11
This paper proposes an integrated multifunctional power converter topology, where a traction battery charger (TBC), an auxiliary battery charger (ABC), and a motor drive converter (MDC) merge into an effective system. Traction battery charging, auxiliary battery charging, and motor driving operation modes can be realized by sharing power components. For the battery charging mode, a single-phase power supply charges the traction battery, and the circuit is capable of power factor correction (PFC) and active power decoupling (APD) (G2V mode). For the purpose of enhancing its charging power, the traction battery can also be connected to a three-phase power supply. For the battery discharging mode, the traction battery can feed energy back to a single-phase grid or a three-phase grid (V2G mode). When necessary, the traction battery can charge an auxiliary battery through a DC-DC converter (T2A mode). In the motor driving mode, the energy of the traction battery is used to drive a motor (T2M mode). Each of the charging modes can be implemented under the galvanic isolated condition. Power relays are used to switch the operating modes of the proposed topology.
Weiqun Chu,Hailong Liu,Qilin Zhang,Fangqin Li,Cheng Peng,Zhihai Cheng,Jiang Wu,Sorachon Yoriya,Ping He,Hai Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Regulation of carrier capture and transport is critical for the enhancement of photocatalytic activity. Inthis work, a Bi5O7I photocatalyst containing double vacant tazetta-like structure was synthesized byone-pot calcination. X-ray photoelectron spectroscopy (XPS) and electron spin resonance spectroscopy(ESR) analysis showed that the vacancy structure improved the activation performance of adsorbed oxygen,thereby promoting the participation of superoxide radicals in the photocatalytic reaction. The resultsof electron paramagnetic resonance (EPR), electrochemical impedance spectroscopy (EIS) and timeresolvedphotoluminescence spectroscopy (TRPL) revealed that the defect state induced by double vacanciescould adjust the electron transport pathway, and the fluorescence lifetime could reach 3.043 ns,which greatly improved the photocatalytic reactivity. We further tested the photocatalytic activity ofheavy metal mercury removal experiment, and the optimal photocatalytic mercury removal efficiencyincreased to 83%. Finally, combining the results of DFT calculation and photocatalytic mercury removalexperiments, we proposed the photocatalytic reaction mechanism of Bi5O7I regulated by double vacancies. Our work provides a more convenient method for the design of defect engineering photocatalystsand provides effective theoretical support for photocatalytic removal of heavy metal mercury in flue gas.
Fangyin Wu,Chuan He,Hao Kou,Bo Wang,Wei Meng,Hailong Meng,Deping Guo 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.5
Due to the limitations of the terrain and other reasons, twin-tunnels with small clear spacing are becoming more and more common. The reasonable clear spacing of twin-tunnels in weak surrounding rock is an urgent problem. In this paper, based on pressure-arch theory (PAT), the method used to calculate the loosening pressure on the surrounding rock of twin-tunnels under three cases was derived by considering the additional disturbance of the excavation on the middle rock pillar through the amplification factors of the sliding angles, k1 and k2. Taking the weak surrounding rock as an example, we discussed the effect of the clear spacing variation on the loosening pressure of the surrounding rock, and obtained the dangerous clear spacing of twin-tunnels. The accuracy and applicability of this approach were verified by the in-site data that were measured. Considering the limitation of the pressure-arch theory on a deep-buried tunnel under high geo-stress, based on the Jiuzhai valley-Mianyang highway in China, the reasonable clear spacing of twin-tunnels in weak surrounding rock at different buried depths, i.e., 400 m − 1,600 m, is discussed using the numerical simulation method. The analytical solution indicated that the loosening pressure of the inner side of the first tunnel was greater than the one of the second due to the amplification factors of the sliding angles, k1 and k2. The in-site data showed that in the weak surrounding rock mass, when k1 and k2 are taken as 1.15 and 1.3, respectively, the loosening pressure distribution law is closest to the actual situation.
Qin, Peng,Wang, Hailong,Yang, Xing,He, Lizhi,Mü,ller, Karin,Shaheen, Sabry M.,Xu, Song,Rinklebe, Jö,rg,Tsang, Daniel C.W.,Ok, Yong Sik,Bolan, Nanthi,Song, Zhaoliang,Che, Lei,Xu, Xiaoya Elsevier 2018 CHEMOSPHERE - Vol.198 No.-
<P><B>Abstract</B></P> <P>Biochar effect on the potential mobility of dibutyl phthalate (DBP), cadmium (Cd), and lead (Pb) in co-contaminated soils is not well investigated. A laboratory leaching study was conducted to evaluate the effect of biochars derived from bamboo (BB) and pig (PB) on the leachability of DBP, Cd, and Pb through soil columns packed with two soils with low or high organic carbon content (LOC; 0.35% C: HOC; 2.24% C) and spiked with DBP, Cd, and Pb. Application of PB to the LOC soil significantly (<I>P</I> < 0.05) reduced the leaching loss by up to 88% for DBP, 38% for Cd, and 71% for Pb, whereas its impact was insignificant in the HOC soil. The higher efficacy of PB in reducing the leaching of DBP, Cd, and Pb in the LOC soil than that of BB might be related to PB's higher specific surface area, surface alkalinity, pH, and mineral contents compared to those of BB. Co-contamination of Cd and Pb enhanced leaching of DBP in the LOC soil treated with PB, possibly by competition for the sorption sites. Leaching of DBP, Cd, and Pb were significantly (<I>P</I> < 0.05) higher in the LOC soil than in the HOC soil. This study revealed that the effectiveness of biochars was dependent on the soil organic carbon content. Application of PB to the LOC soil was effective in reducing the leaching risk of DBP, Cd, and Pb.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pig biochar reduced leaching of DBP, Cd, and Pb in the low organic carbon (LOC) soil. </LI> <LI> Contaminant leaching was higher in the LOC soil than in the high organic carbon soil. </LI> <LI> Existence of Cd and Pb enhanced mobility of DBP in the pig biochar-treated LOC soil. </LI> <LI> Alkalinity and phosphate in biochar controlled the leaching loss of Cd and Pb. </LI> <LI> Impact of pig biochar on leaching of DBP, Cd, and Pb is stronger than bamboo biochar. </LI> </UL> </P>
Dynamics Modeling and Simulation Analysis for Wood High-speed Motorized Spindle
Wei Zhang,Shuangyong Wang,Yang Zhang,Hailong He,Pengfei Zhang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.1
In this paper, considering the main factor in the high-speed processing, including the mass of the spindle, the offset of the centroid, bearing span, bearing stiffness and spindle speed , a dynamic model of the spindle-bearing system is established. After carrying out a simulation by Matlab, vibration curve of the spindle-bearing system is obtained, and influence on the vibration characteristics of the spindle bearing system by the centroid offset is analyzed. These works provide the basis for further studies on the vibration mechanism of the high-speed motorized spindle.