Catalytic performances and leaching behavior of typical natural iron minerals as electro-Fenton catalysts for mineralization of imidacloprid

Wenwei Yu,Faying Lai,Jinbao He,Kaiyun He,Rong Wang,Danping Li,Quanyuan Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-

Catalytic performances and leaching behavior of 9 natural iron minerals as heterogeneous electro-Fentoncatalysts for the treatment of imidacloprid wastewater were studied. The results showed that magnesioferriteexhibited the best catalytic ability among these minerals with UV absorbance at 270 nm (UV270)removal of 83.59% and COD removal of 49.11% within 4 h using graphite cathode and Ti/(RuO2)0.88-(IrO2)0.12 anode at initial pH 3 with a catalyst dose of 5 g/L, a current density of 40 mA/cm2 and an electrodespacing of 2 cm. The instantaneous current efficiency (ICE) at 4 h and energy consumption (EC)reached 2.30% and 2.20 kWh/gCOD respectively. It was found that the components contained in naturaliron minerals, such as Al, alkali metal (K) and alkaline earth metals (Mg, Ca, Ba), would dissolve into theelectrolyte solution, raising the final pH to 6.5–8.5 and ultimately reducing the reaction efficiency. Exceptmagnetite and magnesioferrite, other minerals, such as ilmenite and V-Ti magnetite, were likely to causesecondary pollution. The subsequent adjustment to alkaline state for chemical precipitation of leachedMn was needed. Pyrite showed relatively high leachability in hazardous elements (especially Pb), whichshould be carefully evaluated before its actual application in electro-Fenton process.

Disinfection Effect and Its Mechanism of Electrolyzed Oxidizing Water on Spores of Bacillus subtilis var. niger

Wenwei Tang,Xinping Zeng,Yusheng Zhao,Guoqing Ye,Wenchi Gui,Yaming Ni 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.4

A study was carried out on the disinfection efficiency of electrolyzed oxidizing water (EOW) on spores of Bacillus subtilis var. niger. The results showed a remarkable fungicidal rate of 100% after 20 min duration of 191mg/L active available chlorine (ACC). The disinfection effect was improved with increased ACC or prolonged disinfection time, while organic interferents exerted a strong concentration-dependent inhibition against the disinfection. The disinfection mechanism was also investigated at bio-molecular level. EOW decreased dehydrogenase activity, intensified membrane permeability,elevated suspension conductivity, and caused leakage of intracellular K+, proteins, and DNA, indicating a damage of cell walls and membranes. Effects of EOW on microbiological ultra-structures were also verified by transmission electronic microscopy (TEM) images,showing that EOW destroyed protective barriers of the microbe and imposed some damages upon the nucleus area.

MULTIDISCIPLINARY DESIGN OPTIMIZATION FOR FRONT STRUCTURE OF AN ELECTRIC CAR BODY-IN-WHITE BASED ON IMPROVED COLLABORATIVE OPTIMIZATION METHOD

Wenwei Wang,Fengling Gao,Yuting Cheng,Cheng Lin 한국자동차공학회 2017 International journal of automotive technology Vol.18 No.6

In this investigation, an Improved Collaborative Optimization (ICO) method based Multidisciplinary Design Optimization (MDO) framework for front structure of an electric car body-in-white (BIW) is presented. ICO method based on 1-norm and dynamic flabby coefficient, which shows relatively high efficiency and accuracy, is first proposed here and prepared to conduct MDO in this work. Finite element analysis (FEA) results of the baseline design for an integral battery electric car body structure show that its front part needs to be optimized designed in the consideration of full-lap frontal crashworthiness. Selecting the thicknesses of 5 components, with global mass and free basic frequency constraints, a multidisciplinary size optimization problem is implemented using both ICO and standard CO methods combined with OLHS technique, metamodel and SQL algorithm. Optimal scheme based on ICO method is preferred and selected for its better performance compared with result calculated by standard CO method. The energy absorption of redesigned front body structure is finally raised by 14.2 % with 55 iterations.

INTEGRATED STABILITY CONTROL STRATEGY OF IN-WHEEL MOTOR DRIVEN ELECTRIC BUS

Wenwei Wang,Wei Zhang,Yifan Zhao 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.4

Taking the independently actuated in-wheel motor driven electric bus as the research object, an integrated control strategy of yaw stability and roll stability is proposed. On the basis of the upper and lower layered structure, the stability monitoring layer is added to the control strategy, which is responsible for calculating the desired value of the vehicle\'s critical state and determining the vehicle stability control mode. The upper controller is the yaw moment decision layer. To improve the robustness, the sliding mode control is used to calculate the additional yaw moment required for yaw and roll stability, and the Lyapunov method is used to prove the convergence of the algorithm. The lower controller is the torque distribution layer, which uses the active-set algorithm and combines the motor torque and the braking torque of the braking system to optimally distribute the yaw moment. The proposed control strategy is verified through the co-simulation platform of Trucksim and Simulink. The results show that the control strategy can coordinate the various control modes well, improve the tracking ability of the vehicle, and reduce the risk of side slip and rollover of the vehicle.

Design of Supertall Structures with Connected Towers the Structural Solution to the Development of Sky Cities

Wenwei, Jiang,Qi, Yu,Lianjin, Bao,Mingguo, Liu,Jun, Ji,Dasui, Wang Council on Tall Building and Urban Habitat Korea 2019 International journal of high-rise buildings Vol.8 No.3

Three cases of supertall connected structures are presented and each of them represents a quite style. The first case is a strong-connected structure. The coupling function of towers and connector contributes a lot to the structural stiffness and stability. Its special construction scheme had great impact on the construction quality and the structural safety, and must be accurately considered. For the second case which is a weak-connected structure, the influences of different connecting modes to the structural dynamic characteristic were explained. Then the combined bearings were proposed to achieve the design presume. In the third case which represents the multi-supported structures, the structural distinctive mechanical properties were discussed. For the structural state during construction process is quite different from that in final service condition, two construction procedures were simulated to get an optimal one. Although there are great challenges to designers, the advantages of the supertall connected buildings are obvious. Further work is needed in this area to adapt to the development of future cities.

International Trade "from Status to Contract" and Back: A Critique of the NME Normal Value Determination and Beyond

Wenwei Guan (사) 이준국제법연구원 2014 Journal of East Asia and International Law Vol.7 No.1

This paper critically examines the normal value determination of NME and its implications for the purpose of contributing to Doha antidumping reform deliberation. From domestic to international arenas, antidumping development sees the significant growth of government paternalistic discretion turning antidumping into a distributive instrument challenging constitutionalism. Deeply rooted in the ideological divide of the 1950s, NME methodology's obsession with national divide turns free trade from traders' commutative exchange to nations' distributive predation. NME distributive discretion, though against the free market principle, is ironically used to accuse foreign economies of not being free-market enough. When products and producers are given certain status via nationality instead of treated individually, antidumping development has been a process "from Status to Contract" and back. Therefore, it is time to de-legitimize the NME methodology, and the success of antidumping reform lies in limiting rather than deferring to governments' paternalistic discretion, thus strengthening the international rule of law in the context of WTO.

Effects of sweetener sucralose on diet preference, growth performance and hematological and biochemical parameters of weaned piglets

Zhang, Wenwei,He, Holden,Gong, Limin,Lai, Wenqing,Dong, Bing,Zhang, Liying Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.5

Objective: Two experiments were conducted to investigate the effects of dietary sucralose on diet preference and growth performance of weaned piglets, and a third experiment was a 28-d safety study to examine if high-dose sucralose could affect the health state of weaned piglets. Methods: In experiment one, 48 piglets had free access to a corn-soybean based diet and the same diet supplemented with 150 mg/kg sucralose for 15 d. In experiment two, 180 piglets were blocked into 5 treatments with 6 replications. They were fed basal diets supplemented with 0, 75, 150, 225, and 300 mg/kg sucralose for 28 days. In experiment three, 108 piglets were randomly assigned to 3 treatments and fed diets supplemented with 0, 150 (suitable level), and 1,500 (ten-fold suitable level) mg/kg sucralose for 28 d. Results: The experiment 1 showed that piglets preferred (p<0.05) diets containing sucralose during experimental period. In experiment 2, piglets fed a diet supplemented with 150 mg/kg sucralose had a higher average daily gain (ADG) and average daily feed intake (ADFI) than pigs in the control group and other treatment groups during the experiment period. The concentrations of sucralose over 150 mg/kg may decrease feed intake. However, no difference in feed conversion ratio was observed. In experiment 3, piglets fed diet supplemented with 150 mg/kg sucralose had a higher ADG and ADFI than that of pigs in the control group and 1,500 mg/kg treatment groups during the experiment period. Clinical blood metabolites, organ index and histological morphology were not significantly different between sucralose treatments. Conclusion: Sucralose can promote feed intake and thereby improve growth performance of weaned piglets. Moreover, inclusion of 1,500 mg/kg sucralose was demonstrated to have no observed adverse effects. Supplementing 150 mg/kg sucralose for weaned piglets is recommended in this study.

Dynamic QTL Analysis of Rice Protein Content and Protein Index Using Recombinant Inbred Lines

Leina Zheng,Wenwei Zhang,Xingang Chen,Jing Ma,Weiwei Chen,Zhigang Zhao,Huqu Zhai,Jianmin Wan 한국식물학회 2011 Journal of Plant Biology Vol.54 No.5

Protein content (PC) and protein index (PI) play important roles in determining nutritional quality in rice (Oryza sativa L.). We used 71 lines derived from “Asominori/IR24” to analyze the developmental behavior of PC and PI through unconditional and conditional QTL mapping methods. In all, 10 unconditional QTLs and 6conditional QTLs for PC, and 11 unconditional QTLs and 9conditional QTLs for PI, were identified at four stages of grain filling. More were identified in the first three stages than at the final stage. Temporal patterns of gene expression for PC and PI differed over time, with several QTLs being expressed across two or three stages but many being expressed at only one stage. Some of these QTLs were closely linked with maturity QTLs reported previously. Many QTLs for PC and PI were co-localized, supporting the significant correlation found between PC and PI. Our results suggest that dynamic QTL mapping might be a valid means for revealing more genetic information about protein accumulations during seed development.

Efficient photocatalytic degradation of 2-chloro-4,6-dinitroresorcinol in salty industrial wastewater using glass-supported TiO2

Yuan Zhang,Wenwei Jiang,Yongsheng Ren,Baoming Wang,Yong Liu,Quanxian Hua,Jianwei Tang 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3

2-chloro-4,6-dinitroresorcinol (CDNR) is detrimental to the environment and human health owing to its high toxicity and poor biodegradability. To demonstrate the feasibility of photocatalytic degradation of CDNR from industrial salty wastewater by borosilicate glass supported TiO2 under UV light irradiation, borosilicate glass supported TiO2 was prepared successfully by a novel sol-gel route via dip-coating method and characterized by XRD, SEM, FTIR and XPS analysis. The results showed that TiO2 catalyst has the anatase phase structure with crystallite size of 11.5 nm and coats uniformly on the borosilicate glass. Also, the effects of reaction time, pH value, TiO2 dosage, CDNR concentration, and Cl on the degradation efficiency of CDNR were investigated. The results indicated that at pH 2, reaction time 3.5 h, CDNR concentration 10mg/L, NaCl concentration 5.85% (w/w) and TiO2 dosage 1.0 g/L, 97.7% of CDNR was degraded in the presence of Cl, this corresponded to a rate constant of 1.05 h1, illustrating the feasibility of photocatalytic degradation process. This contribution provides a basic investigation regarding the potential application of borosilicate glass supported TiO2.

Hierarchical Community Detection Algorithm Based on Node Similarity

Jingke Xi,Wenwei Zhan,Zhixiao Wang 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.6