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Synthesis of molybdenum disulfide/reduced graphene oxide composites for effective removal of Pb(Ⅱ) from aqueous solutions

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Science Bulletin 2017年第13期62卷 913-922页

作者： yi du Jian Wang yidong Zou Wen Yao Jing Hou Liangshu Xia Anguo peng Ahmed Alsaedi Tasawar Hayat Xiangke Wang College of Environmental Science and Engineering North China Electric Power University School of Nuclear Science and Technology University of South China NAAM Research Group Faculty of ScienceKing Abdulaziz University Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions School for Radiological and Interdisciplinary SciencesSoochow University

In this work, a facile method was adopted to synthesize molybdenum disulfide/reduced graphene oxide （MoS2/rGO） composites through an c-cysteine-assisted hydrothermal technique, The as-prepared MoS2/ rGO composites were firstly applied as adsorbents for efficient elimination of Pb（Ⅱ） ions. Batch adsorption experiments showed that the adsorption of Pb（Ⅱ） on MoS2/rGO followed pseudo-second-order kinetic model well. The adsorption of Pb（Ⅱ） was intensely pH-dependent, ionic strength-dependent at pH 〈 9.0 and ionic strength-independent at pH 〉 9,0, The presence of humic acid （HA） enhanced Pb（Ⅱ） adsorption obviously. The MoS2/rGO composites exhibited excellent adsorption capacity of 384.16 mg g 1 at pH 5.0 and T = 298.15 K, which was superior to MOS2 （279.93 mg g 1） and many other adsorbents. The thermodynamic parameters suggested that the adsorption process of Pb（Ⅱ） on MoS2/rGO composites was spontaneous （zSG＂〈 O） and endothermic （△H 〉 0）. The interaction of Pb（Ⅱ） and MoS2] rGO was mainly dominated by electrostatic attraction and surface comple^ation between Pb（Ⅱ） and oxygen-containing functional groups of MoS2]rGO. This work highlighted the application of MoS21rGO as novel and promising materials in the efficient elimination of Pb（Ⅱ） from contaminated water and industrial effluents in environmental pollution management.

关键词： Molybdenum disulfideReduced graphene oxideMoS2/rGO compositesAdsorptionPb(Ⅱ)

Heteropolyacids supported on hierarchically macro/mesoporous TiO_(2):efficient catalyst for deep oxidative desulfurization of fuel

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Tungsten 2022年第1期4卷 28-37页

作者： Gao-Chen Yang Qi-Yun Pan peng Yang yi-Si Liu Yue du Kai Wang School of Materials Science and Engineering Hubei UniversityWuhan 430070China Institute for Advanced Materials Hubei Normal UniversityHuangshi 435002China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The fabrication of polyoxometalates(POMs)-modified TiO_(2)catalysts with connected pore structure has attracted great interests due to its prominent effect on mass transfer and catalytic oxidation ***,we report a series of hierarchically macro/mesoporous(M/m)phosphotungstic acid(HPW)/TiO_(2)composites,which are fabricated by colloidal crystal template method and applied as deep desulfurization catalyst in fuel ***-synthesized hierarchical HPW/TiO_(2)composite is interconnected by ordered macroporous channel with disordered mesoporous embedded on pore ***,Keggintype HPW is homogeneously dispersed on the TiO_(2)*** macro/mesoporous HPW/TiO_(2)shows an excellent catalytic performance,the removal rate for dibenzothiophene in model fuel reaches 99%under the optimum *** high performance of the three-dimensional ordered macropores(3DOM)HPW/TiO_(2)can be attributed to its hierarchically porous which is highly beneficial for the mass transfer during the catalytic ***,the used catalyst could be regenerated by centrifugation and only slight decreasing of the catalytic activity after five cycles.

关键词： Oxidative desulfurization Heteropolyacid Macro/mesoporous Hierarchical porous materials

Correlation between blood circulation grading and angiogenesis using ultrasonic contrast of rabbit VX2 hepatic carcinoma

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Asian Pacific Journal of Tropical Medicine 2016年第2期9卷 148-153页

作者： Chang-Song Xu yi-Jin Su Ming Xu Wei Liu peng Hao Lian-Fang du Department of Ultrasound Huai'an First People's Hospital Nanjing Medical University Department of Ultrasound Shanghai General Hospital of Nanjing Medical University

Objective: To build the rabbit model of VX2 hepatic carcinoma, examine the tumor body using the ultrasonic contrast and study the correlation between the blood circulation grading and angiogenesis. Methods: The VX2 tumor strain was prepared in the lateral muscle of the hind legs of 40 male New Zealand rabbits (which were purchased from Nanjing Senbao Biotech Co., Ltd.). The tumor block was embedded in the center of left liver lobe directly to build the rabbit model of VX2 hepatic carcinoma. The ultrasonic contrast was performed 14 d after implanting the tumor body. The semi-quantitative classification (0-IV level) was taken according to the blood flow of tumor vessel. Animals were executed using the air embolism method. The liver was separated to extract RNA and total protein respectively. The real-time PCR and western blotting method were employed to detect the expression of angiogenesis-related factors of VEGF, bFGF and TNP-alpha, while the ultrasonic contrast to detect the correlation with blood circulation grading. The Pearson product moment correlation coefficient was used to measure the linear relationship between these two variables and analyze the correlation between the blood circulation grading and angiogenesis using the ultrasonic contrast. Results: Thirty-three rabbits had the successful model of VX2 hepatic carcinoma. The blood circulation grading by ultrasonic contrast was: 2 cases at level 0 (6.60%), 5 cases at level I (16.7%), 12 cases at level 11 (40.0%), 6 cases at level III (20.0%) (local dense or clustered blood flow) and 5 cases at level IV (16.7%). The results showed that there was positive correlation between three angiogenesis-related factors and the blood circulation grading. The correlation coefficient between three angiogenesis-related factors and the blood circulation grading was over 0.9, which indicated the relatively high correlation. Conclusions: The ultrasound blood circulation grading for the hepatic carcinoma can clearly reflect th

关键词： Hepatic carcinoma VX2 Ultrasonic contrast Angiogenesis bFGF TNF-alpha

Comparison of resonant current regulators for DFIG during grid voltage distortion

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第12期14卷 953-965页

作者： yi-peng SONG Heng NIAN College of Electrical Engineering Zhejiang University

We investigate two different kinds of resonant current regulators for a doubly fed induction generator(DFIG) under distorted grid voltage conditions: proportional integral resonant(PIR) regulator with traditional resonant part and vector proportional integral(VPI) regulator with VPI resonant part. Based on the mathematical model of DFIG under distorted grid voltage, the transfer function and frequency response characteristics of the two current regulators are analyzed and compared. The superiority of the VPI current regulator over the PIR regulator is pointed out, and the influence of discretization methods on the performance of the resonant current regulator is studied. All the results are validated by MATLAB simulation and experiments.

关键词： Doubly fed induction generator Harmonically distorted grid voltage Resonant current regulator Vector PI current regulator Diseretization method

On a BMAP/G/1 G-queue with Setup Times and Multiple Vacations

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Acta Mathematicae Applicatae Sinica 2011年第4期27卷 625-638页

作者： yi peng Xiang-qun YANG School of Mathematical Science and Computing Technology Central South University Changsha 410075 Hunan China College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China

In this paper, we consider a BMAP/G/1 G-queue with setup times and multiple vacations. Arrivals of positive customers and negative customers follow a batch Markovian arrival process （BMAP） and Markovian arrival process （MAP） respectively. The arrival of a negative customer removes all the customers in the system when the server is working. The server leaves for a vacation as soon as the system empties and is allowed to take repeated （multiple） vacations. By using the supplementary variables method and the censoring technique, we obtain the queue length distributions. We also obtain the mean of the busy period based on the renewal theory.

关键词： G-queues batch Markovian arrival process (BMAP) setup times multiple vacations censoring technique Markov chains

Identifying spatiotemporal traffic patterns in large-scale urban road networks using a modified nonnegative matrix factorization algorithm

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第4期7卷 529-539页

作者： Xiaolei Ma yi Li peng Chen School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Beiing Advanced Innovation Center for Big Data and Brain Computing Beihang UniversityBeiing 100191China

The identification and analysis of spatiotemporal traffic patterns in road networks constitute a crucial process for sophisticated traffic management and *** methods based on mathematical equations and statistical models can hardly be applicable to large-scale urban road networks,where traffic states exhibit high degrees of dynamics and ***,advances in data collection and processing have provided new opportunities to effectively understand spatiotemporal traffic patterns in large-scale road networks using data-driven ***,limited efforts have been exerted to explore the essential structure of the networks when conducting a spatiotemporal analysis of traffic *** this end,this study proposes a modified nonnegative matrix factorization algorithm that processes high-dimensional traffic data and provides an improved representation of the global traffic *** matrix factorization,cluster analysis is conducted based on the obtained low-dimensional representative matrices,which contain different traffic patterns and serve as the basis for exploring the temporal dynamics and spatial structure of network *** applicability and effectiveness of the proposed approach are examined in a road network of Beijing,*** show that the methods exhibit considerable potential for identifying and interpreting the spatiotemporal traffic patterns over the entire network and provide a systematic and efficient approach for analyzing the network-level traffic state.

关键词： Large-scale network Traffic state Spatiotemporal patterns Nonnegative matrix factorization

Distributed policy evaluation via inexact ADMM in multi-agent reinforcement learning

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Control Theory and Technology 2020年第4期18卷 362-378页

作者： Xiaoxiao Zhao peng yi Li Li College of Electronic and Information Engineering Tongji UniversityShanghai 201804China Institute of Intelligent Science and Technology Tongji UniversityShanghai 201203China

This paper studies a distributed policy evaluation in multi-agent reinforcement *** cooperative settings,each agent only obtains a local reward,while all agents share a common environmental *** optimize the global return as the sum of local return,the agents exchange information with their neighbors through a communication *** mean squared projected Bellman error minimization problem is reformulated as a constrained convex optimization problem with a consensus constraint;then,a distributed alternating directions method of multipliers(ADMM)algorithm is proposed to solve ***,an inexact step for ADMM is used to achieve efficient computation at each *** convergence of the proposed algorithm is ***@***;LilLi received the *** *** from Shengyang Agri-culture University,China in 1996 and *** the *** from Shenyang Institute of Automation,Chinese Academy of Science,in *** joined Tongji Universitry,Shanghai,China,in 2003,and is now a professor at the Depart-ment of Control Science and *** research inter-ests are in data-driven modeling and opimization,computaional intelligence.

关键词： Multi-agent system Reinforcement learning Distributed optimization Policy evaluation

POLISHING OF NON-FERROUS METALS WITH HIGH EFFICIENCY

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中国有色金属学会会刊：英文版 1998年第3期8卷 126-129页

作者： Chen, Yuquan peng, Guangbin Pei, yi Harbin Univ of Science & Technology Harbin China

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１ＩＮＴＲＯＤＵＣＴＩＯＮＢｅｓｉｄｅｓｓｔｅｅｌｓ，ｎｏｎｆｅｒｏｕｓｍｅｔａｌｓｓｕｃｈａｓａｌｕｍｉｎｉｕｍ，ｃｏｐｐｅｒ，ｔｉｔａｎｉｕｍａｎｄｔｈｅｉｒａｌｏｙｓａｒｅｖｅｒｙｉｍｐｏｒｔａｎｔｍａｔｅｒｉａｌｓ，ｄｕｅｔｏｔｈｅｉｒａ...

关键词： non ferrous metals electrolysis polishing abrasive magnetic field

Digital interventions for autism spectrum disorders: A systematic review and meta-analysis

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儿科学研究(英文) 2024年第3期8卷 224页

作者： Wang Tianqi Ma Yu du Xiaonan Li Chunpei peng Zhongbi Wang yi Zhou Hao Department of Neurology National Children’s Medical Center Children’s Hospital of Fudan University Shanghai China Department of Neurological Rehabilitation Guizhou Branch of Shanghai Children’s Medical Center Shanghai Jiao Tong University School of Medicine Guizhou China Department of Pediatrics Guizhou Provincial People’s Hospital Medical College of Guizhou University Guizhou China

Importance: Digital technology is now widely available for the interventions of autism, but its validity and feasibility remain to be ***: This study aimed to investigate the effectiveness of digital health interventions (DHIs) in improving core symptoms or intelligence quotient in patients with autism spectrum disorder (ASD).Methods: Three databases including PubMed, Cochrane, and Scopus, were searched on November 15, 2022. Randomized clinical trials that enrolled patients with ASD who received DHIs and a control group without DHI treatment were included. Cochrane risk of bias tool (RoB 2) was applied to assess the risk of ***: A total of 33 studies, involving 1285 participants (658 [51.2%] in DHI groups and 627 [48.8%] in control groups), were analyzed to investigate the differences between DHI groups and control groups. Significantly greater improvements in the overall performance of ASD were observed in the DHI groups compared to the control groups (including active, waitlist, treatment-as-usual, and no treatment) with an effect size of 1.89 (Cohen’s d 95% confidence interval [CI]: 1.26-2.52). Studies with treatment-as-usual, waitlist, and no treatment control demonstrated large effect sizes of Cohen’s d 3.41 (95% CI: 0.84-5.97), Cohen’s d 4.27 (95% CI: 1.95-6.59), and Cohen’s d 4.52 (95% CI: 2.98-6.06) respectively. In contrast, studies with active control revealed insignificant effect sizes (Cohen’s d 0.73, 95% CI: 0.12-1.33).Interpretation: This meta-analysis found significantly greater improvements in core symptoms or intelligence quotient in ASD patients receiving DHIs compared to those in control conditions. ASD patients may benefit from the DHIs and reduce the economic burden.

关键词： Autism spectrum disorder Digital interventions Meta-analysis Robotic interventions