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Decomposition analysis applied to energy and emissions:A literature review

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Frontiers of Engineering Management 2023年第4期10卷 625-639页

作者： Hui WANG yafei yang School of Economics and Management China University of PetroleumQingdao 266580China Institute for Energy Economics and Policy China University of PetroleumQingdao 266580China

Decomposition analysis has been widely used to assess the determinants of energy and CO_(2)emissions in academic research and policy *** the methodology and application of decomposition analysis have been largely improved in the past *** more than 50 years’developments,decomposition studies have become increasingly sophisticated and diversified,and tend to converge internally and integrate with other analytical approaches externally.A good understanding of the literature and state of the art is critical to identify knowledge gaps and formulate future research *** this end,this study presents a literature survey for decomposition analysis applied to energy and emission issues,with a focus on the period of 2016–2021.A review for three individual decomposition techniques is first conducted,followed by a synthesis of emerging trends and features for the decomposition analysis literature as a *** findings are expected to direct future research in decomposition analysis.

关键词： index decomposition analysis structural decomposition analysis production decomposition analysis energy CO_(2)emissions

A strategy for enhancing anaerobic digestion of waste activated sludge: Driving anodic oxidation by adding nitrate into microbial electrolysis cell

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Journal of Environmental Sciences 2019年第7期31卷 34-42页

作者： Hong Peng Zhiqiang Zhao Hong Xiao yafei yang Huimin Zhao Yaobin Zhang Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology) Ministry of Education School of Environmental Science and Technology Dalian University of Technology Department of Environmental Science College of Environmental Sciences Sichuan Agricultural University-Chengdu Campus

Cathodic reduction of CO_2 and anodic oxidation of organic matters are crucial to methaneproducing microbial electrolysis cell(MEC) applied in anaerobic digestion of waste activated sludge. However, cathodic CO_2 reduction is usually restrained by slow metabolism rates of H_2-utilizing methanogens and low electron-capturing capacity of CO_2, which consequently slows down the anodic oxidation that participates to sludge disintegration. Herein, a strategy with adding nitrate as electron acceptor to foster electronic transfer between the anode and cathode was proposed to improve anodic oxidation. Results showed that the average efficiency of anodic oxidation in the nitrate-added MEC increased by 55.9%. Accordingly,volatile suspended solid removal efficiency in the nitrate-added MEC was 21.9% higher than that of control MEC. Although the initial cumulative methane production in the nitrateadded MEC was lower than that of control MEC, the cumulative methane production in 24 days was 8.9% higher. Fourier transform infrared spectroscopy analysis indicated that anodic oxidation of MEC with nitrate accelerated the disintegration of sludge flocs and cell walls. Calculation on current signal further revealed that anodic oxidation driven by cathodic nitrate reduction was the main mechanism responsible for the improved sludge digestion.

关键词： Waste activated sludge Microbial electrolysis cell Nitrate Anodic oxidation Sludge reduction

Unraveling the modulation essence of p bands in Co-based oxide stability on acidic oxygen evolution reaction

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Nano Research 2024年第7期17卷 5922-5929页

作者： yafei yang Yihao Xu Haiquan Liu Qi Zhang Boling Liu Menghua yang Huan Dai Zunjian Ke Dong He Xiaobo Feng Xiangheng Xiao Department of Physics Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhan 430072China School of Physics and Electronic Information Yunnan Normal UniversityKunming 650500China Yunnan Key Laboratory of Opto-electronic Information Technology Kunming 650500China

The oxygen evolution reaction(OER)electrocatalysts,which can keep active for a long time in acidic media,are of great significance to proton exchange membrane water ***,Ru-Co_(3)O_(4)electrocatalysts with transition metal oxide Co_(3)O_(4)as matrix and the noble metal Ru as doping element have been prepared through an ion exchange–pyrolysis process mediated by metal-organic framework,in which Ru atoms occupy the octahedral sites of Co_(3)O_(4).Experimental and theoretical studies show that introduced Ru atoms have a passivation effect on lattice *** strong coupling between Ru and O causes a negative shift in the energy position of the O p-band ***,the bonding activity of oxygen in the adsorbed state to the lattice oxygen is greatly passivated during the OER process,thus improving the stability of matrix *** addition,benefiting from the modulating effect of the introduced Ru atoms on the metal active sites,the thermodynamic and kinetic barriers have been significantly reduced,which greatly enhances both the catalytic stability and reaction efficiency of Co_(3)O_(4).

关键词： p-band modulation oxygen evolution reaction stability acidic oxygen evolution reaction(OER)

Mathematical representation of 2D image boundary contour using fractional implicit polynomial

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Optoelectronics Letters 2023年第4期19卷 252-256页

作者： TONG Yuerong YU Lina LI Weijun LIU Jingyi WU Min yang yafei Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China School of Materials Science and Optoelectronic Technology&School of Integrated Circuits University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory of Semiconductor Neural Network Intelligent Sensing and Computing Technology Beijing 100083China DapuStor Corporation Shenzhen 518100China

Implicit polynomial(IP)fitting is an effective method to quickly represent two-dimensional(2D)image boundary contour in the form of mathematical *** the same maximum degree,the fractional implicit polynomial(FIP)can express more curve details than IP and has obvious advantages for the representation of complex boundary *** existing studies,algebraic distance is mainly used as the fitting objective of the *** the time cost is reduced,there are problems of low fitting accuracy and spurious zero *** this paper,we propose a two-stage neural network with differentiable geometric distance,which uses FIP to achieve mathematical representation,called *** the first stage,the continuity constraint is used to obtain a rough outline of the fitting *** the second stage,differentiable geometric distance is gradually added to fine-tune the polynomial coefficients to obtain a contour representation with higher *** results show that TSEncoder can achieve mathematical representation of 2D image boundary contour with high accuracy.

关键词： polynomial contour representation

The d-orbital coupling modulation of CuNi alloy for acetonitrile electrochemical reduction and in-situ hydrogenation behavior characterization

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Science China Chemistry 2023年第11期66卷 3242-3251页

作者： Boling Liu Dong He Zunjian Ke Hongbo Wang Chongyang Tang Qi Zhang Hang Xu Menghua yang yafei yang Qi Liu Xiangheng Xiao School of Physics and Technology Wuhan UniversityWuhan 430072China Wuhan Research Center for Infectious Diseases and Cancer Chinese Academy of Medical SciencesWuhan 430072China Department of Physics City University of Hong KongHong Kong 999077China

Electrochemical reduction of acetonitrile to ethylamine with a high selectivity is a novel approach to manufacture valuable primary amines which are important raw material in organic chemical industry. However, the poor ethylamine Faradic efficiency(FE_(ethylamine)) and catalyst stability at the high current density prohibit this method from being practically used. Herein, CuNi alloy ultrafine-nano-particles based on the d-orbital coupling modulation were synthesized through the electrodeposition and their catalytic performance towards acetonitrile reduction reaction(ACNRR) has been systematically studied. The highest FE_(ethylamine)(97%) is achieved with the current density of-114 mA cm^(-2). For practical application, the current density can reach-602.8 mA cm^(-2) with 82.8% FE_(ethylamine)maintained. With the appearance of other organics which co-exist with acetonitrile in the SOHIO process, CuNi can also hydrogenate acetonitrile in it with more than 80% FE_(ethylamine). Our in-situ spectroscopy analysis and DFT calculations towards the acetonitrile hydrogenation behavior reveal that the evenly dispersed Ni in Cu modulates the dband so as to endow CuNi with the better acetonitrile adsorption, milder binding energy with the reaction intermediates, smaller barrier for *CH_3CH_2NH_2 desorption and higher ability for H_2O dissociation to provide *H.

关键词： CuNi alloy acetonitrile reduction reaction d-orbital coupling modulation in-situ spectroscopy analysis acetonitrile adsorption

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Periodic Solution for Stochastic Predator-Prey Systems with Nonlinear Harvesting and Impulses

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Advances in Linear Algebra & Matrix Theory 2019年第4期9卷 89-103页

作者： yafei yang Yuanfu Shao Mengwei Li College of Physics Guilin University of Technology Guilin China

In this paper, astochastic predator-prey systems with nonlinear harvesting and impulsive effect are investigated. Firstly, we show the existence and uniqueness of the global positive solution of the system. Secondly, by constructing appropriate Lyapunov function and using comparison theorem with an impulsive differential equation, we study that a positive periodic solution exists. Thirdly, we prove that system is globally attractive. Finally, numerical simulations are presented to show the feasibility of the obtained results.

关键词： Impulses Perturbations Periodic Solution Non-Linear Harvesting Stochastic Predator-Prey Systems Globally Attractive

Dynamics of a Stochastic Delayed Predator-Prey System with Beddington-DeAngelis Functional Response

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International Journal of Modern Nonlinear Theory and Application 2019年第4期8卷 93-105页

作者： Mengwei Li Yuanfu Shao yafei yang College of Physics Guilin University of Technology Guilin China

This paper is concerned with a stochastic predator-prey system with Beddington-DeAngelis functional response and time delay. Firstly, we show that this system has a unique positive solution as this is essential in any population dynamics model. Secondly, the validity of the stochastic system is guaranteed by stochastic ultimate boundedness of the analyzed solution. Finally, by constructing suitable Lyapunov functions, the asymptotic moment estimation of the solution was given. These properties of the solution can provide theoretical support for biological resource management.

关键词： Beddington-DeAngelis Response Stochastic Perturbation Stochastic Ultimate Boundedness Asymptotic Moment Estimation

Analysis of a Delayed Stochastic One-Predator Two-Prey Population Model in a Polluted Environment

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Journal of Applied Mathematics and Physics 2019年第10期7卷 2265-2282页

作者： Mengwei Li Yuanfu Shao yafei yang College of Physics Guilin University of Technology Guilin China

This paper is concerned with the dynamics of a delayed stochastic one-predator two-prey population model in a polluted environment. We show that there exists a unique positive solution that is permanent in time average under certain conditions. Moreover, the global attractively of system is studied. Finally, some numerical simulations are given to illustrate the main results.

关键词： Random Perturbations Time Delays Pollution Permanent in Time Average

Periodic Solution for a Stochastic Predator-Prey Model with Impulses and Holling-II Functional Response

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Journal of Applied Mathematics and Physics 2019年第10期7卷 2212-2230页

作者： yafei yang Yuanfu Shao Mengwei Li College of Physics Guilin University of Technology Guangxi China

Considering the mutual interference between species, a stochastic predator-prey model with impulses and Holling-II functional response is proposed in this paper. Firstly, by constructing an equivalent system without impulses, the existence of a globally unique positive solution is proved. Secondly, in cases of the mutual coefficient m = 1 and 0 m < 1, by constructing suitable Lyapunov functional, the existence of T-periodic solution is investigated under some certain conditions. Finally, numerical simulation is introduced to verify our main results.

关键词： Stochastic Impulses Mutual Interference Periodic Solution