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Nanoporous tin oxides for efficient electrochemical CO_(2) reduction to formate

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Green Chemical Engineering 2022年第2期3卷 138-145页

作者： Hai Liu Baiyu Miao hongyuan chuai Xiaoyi Chen Sheng Zhang Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Zhejiang Institute of Tianjin University Ningbo315201China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China

CO_(2)electroreduction reaction(CO_(2)RR)has been considered as an effective technology to close the anthropogenic carbon ***,a product of two-electron transfer in CO_(2)RR,is an economically valuable *** this work,nanoporous tin oxides were controllable synthesized by a facile and scalable electrochemical anodic oxidation *** result indicated that the increased Sn 4þspecies after anodic oxidation were beneficial to reduce the overpotential of formate *** Raman spectra revealed that the enhanced formate selectivity could be attributed to the high local pH within the porous structure,which suppresses hydrogen evolution reaction(competing reaction against CO_(2)RR).Further flow cell test showed a formate partial current density of 285 mA cm^(-2)with the selectivity of 96.4%,indicating a promising industrial application prospect.

关键词： CO_(2)electroreduction Porous SnO_(2) Anodic oxidation Formate Selectivity

Copper-based bimetallic electrocatalysts for CO_(2) reduction:From mechanism understandings to product regulations

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Materials Reports(Energy) 2023年第1期3卷 19-34,I0002页

作者： Haibei Yang hongyuan chuai Qingrui Meng Meiyan Wang Sheng Zhang Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education Haihe Laboratory of Sustainable Chemical TransformationsSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207China

Electrocatalytic carbon dioxide reduction reaction(CO_(2) RR)is a promising method to solve current environment and energy ***-based catalysts have been widely studied for converting CO_(2) into value-added hy-drocarbon *** monometallic catalyst has been proved to have some shortcomings,including relatively high energy barriers and diverse reaction pathways,leading to low reaction activities and poor product selec-tivity,*** copper-based bimetallic tandem catalysts have attracted extensive attentions due to their special catalyst structure,which can be easily regulated to achieve high CO_(2) RR reactivity and product *** the development of quantum chemistry calculations and spectroscopic characterization methods,deep understandings of CO_(2) RR from the mechanism perspective provide a broad horizon for the design of effi-cient *** review offers a good summary of reaction mechanisms and product regulation strategies over copper-based bimetallic catalysts,along with a brief discussion on future directions towards their practical applications.

关键词： Copper Bimetallic electrocatalysts Carbon dioxide reduction Mechanism Product regulations

MoO_3/V_2O_5异质结构材料的静电纺丝法制备及光催化性能

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高等学校化学学报 2014年第5期35卷 941-948页

作者：揣宏媛周德凤朱晓飞杨国程李朝辉长春工业大学化学与生命科学学院长春130012

以聚乙烯吡咯烷酮(PVP)、四水合钼酸铵[(NH4)6Mo7O24·4H2O]和偏钒酸铵(NH4VO3)为原料,利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO3/V2O5异质结构半导体光催化剂.采用X射线衍射光谱(XRD)、傅里叶变换红外光... 详细信息

以聚乙烯吡咯烷酮(PVP)、四水合钼酸铵[(NH4)6Mo7O24·4H2O]和偏钒酸铵(NH4VO3)为原料,利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO3/V2O5异质结构半导体光催化剂.采用X射线衍射光谱(XRD)、傅里叶变换红外光谱(FTIR)、场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱等测试手段对材料进行了表征.以光降解亚甲基蓝(MB)为模型反应,考察了MoO3/V2O5异质结构材料的光催化性能.结果表明,n(Mo)/n(V)>1∶8时均能形成MoO3/V2O5异质结构且带隙明显宽于V2O5,可有效地实现光生电子和空穴的分离,增强体系的量子效率,促进光催化活性的提高,其中n(Mo)/n(V)=1∶6时光催化活性最高(达到97.24%),并分析和探讨了光催化机理.

关键词：光催化剂异质结构静电纺丝法

Experimental Study on Ultrasonic Cavitation Intensity Based on Fluorescence Analysis

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 196-204页

作者： Linzheng Ye Shida chuai Xijing Zhu Dong Wang Shanxi Key Laboratory of Advanced Manufacturing Technology School of Mechanical EngineeringNorth University of ChinaTaiyuan 030051China College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeter EX44QFUK

The Ultrasonic cavitation effect has been widely used in mechanical engineering,chemical engineering,biomedicine,and many other *** quantitative characterization of ultrasonic cavitation intensity has always been a *** on this,a fluorescence analysis method has been adopted to explore ultrasonic cavitation intensity in this *** the experiment of fluorescence intensity measurement,terephthalic acid(TA)was used as the fluorescent probe,ultrasonic power,ultrasonic frequency,and irradiation time were independent variables,and fluorescence intensity and fluorescence peak area were used as experimental *** collapse of cavitation bubble will cause molecular bond breakage and release·OH,and the non-fluorescent substance TA will form the strong fluorescent substance TAOH with·*** spectra of the treated samples were measured by a F-7000 fluorescence *** results showed that the fluorescence intensity and fluorescence peak area increased rapidly after ultrasonic cavitation treatment,and then increased slowly with the increase of ultrasonic power,which gradually increased with the increase of irradiation *** first decreased and then increased with the increase of ultrasonic frequency from 20 kHz to 40 *** irradiation time was the most influential factor,and the cavitation intensity of low frequency was higher *** fluorescence intensity and fluorescence peak area of the samples increased by 2-20 times after ultrasonic treatment,which could increase from 69 and 5238 to 1387 and 95451,*** the irradiation time exceeded 25 min,the growth rate of fluorescence intensity slowed down,which was caused by the decrease of gas content and TA concentration in the *** study quantitatively characterized the cavitation intensity,reflecting the advantages of fluorescence analysis,and provided a basis for the further study of ultra-sonic cavitation.

关键词： Ultrasonic cavitation Cavitation intensity Fluorescence intensity Fluorescence peak area

QoS-aware scheduling algorithm in relay-assisted LTE-A system

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 16-21页

作者： chuai Gang YU Xiao-liang School of Information and Communication Engineering Beijing University of Posts and Telecommunications Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications

This paper details on the uplink scheduling algorithm for long term evolution advanced （LTE-A） system with relays. While emulating quality of service （QoS）-aware services with different bit-rate and delay budget requirements for the upstream direction, a new QoS-aware scheduling algorithm for in-band relays is proposed. In this work, an improved scheduling metric calculation method and bit-rate guarantee scheme is applied. Moreover, this algorithm proposes an efficient scheme for the backhaul link allocation which allows information of the most backlogged users to be transmitted first. Finally, this paper concludes with simulation results to demonstrate how the proposed resource allocation strategy improves the performance of the system.

关键词： relay station scheduling algorithm guaranteed bit rate (GBR) backhaul link access link

QoS-priority based load balancing algorithm for LTE systems with mixed users

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The Journal of China Universities of Posts and Telecommunications 2015年第3期22卷 9-17页

作者： chuai Gang Meng Fanfan Sun Li School of Information and Communication Engineering Beijing University of Posts and Telecommunications Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Focusing on the load balancing problem among multi-cells in long term evolution （LTE） networks with mixed users, a new multi-objective optimization modeling strategy, which integrates the guaranteed bit rate （GBR） and the best effort （BE） users, was proposed. In consideration of quality of service （QoS） priorities of different users, a decomposition method was presented to solve the original model. Derivations such as applying Lagrange multiplier method, sub-optimal solutions for mixed users were deduced. Based on derived solutions, including resource allocation schemes, a practical multi-objective load balancing algorithm jointly dealing with mixed users was given. Simulation shows a significant improvement of GBR users＇ satisfaction level and BE users＇ throughput in LTE networks by using the proposed algorithm.

关键词： long term evolution system quality of service mixed users multi-objective optimization load balancing resource allocation

Monkeypox virus:a re-emergent threat to humans

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Virologica Sinica 2022年第4期37卷 477-482页

作者： Qizan Gong Changle Wang Xia chuai Sandra Chiu Division of Life Sciences and Medicine University of Science and Technology of ChinaHefei230026China Department of Pathogenic Biology Hebei Medical UniversityShijiazhuangHebei050017China

Human monkeypox(MPX)is a rare zoonotic infection characterized by smallpox-like signs and *** is caused by monkeypox virus(MPXV),a double stranded DNA virus belonging to the genus *** was first identified in 1970 and mostly prevailed in the rural rainforests of Central and West Africa in the *** Africa,MPX was reported in the United Kingdom,the USA,Israel,and *** 2022,the resurgence of MPX in Europe and elsewhere posed a potential threat to *** was transmitted by the animals-human or human-human pathway,and the symptoms of MPXV infection are similar to that of smallpox,but in a milder form and with lower mortality(1%–10%).Although the smallpox vaccination has been shown to provide 85%protection against MPXV infection,and two anti-smallpox virus drugs have been approved to treat MPXV,there are still no specific vaccines and drugs against MPXV *** it is urgent to take active measures including the adoption of novel anti-MPXV strategies to control the spread of MPXV and prevent MPX *** this review,we summarize the biological features,epidemiology,pathogenicity,laboratory diagnosis,and prevention and treatment strategies on *** review provides the basic knowledge for prevention and control of future outbreaks of this emerging infection.

关键词： Monkeypox virus(MPXV) Orthopoxvirus Smallpox vaccine Antiviral drugs

Spatial and Temporal Dynamics of Surface Water in China from the 1980s to 2015 Based on Remote Sensing Monitoring

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Chinese Geographical Science 2022年第1期32卷 174-188页

作者： SONG Song CAO Zheng WU Zhifeng chuai Xiaowei School of Geography and Remote Sensing Guangzhou UniversityGuangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratoty(Guangzhou) Guangzhou 511458China School of Geographic and Oceanographic Science Nanjing UniversityNanjing 210046China

Climate change and human interference play significant roles on dynamic of water body abundance,and drive related hydrological,biochemical and social/economic *** and monitoring surface water area with high resolution multi-temporal satellite imagery provide new perspective to evaluate the dynamics of surface water area,especially in continental and global *** this study,based on the Landsat images from 1980 s to 2015,we surveyed the spatial and temporal variation of surface water area,including rivers,lakes and reservoirs,in 10-yr temporal slice across ***,the driving forces of the variation has been identified to reveal the interaction of water bodies and the changing *** results show that,the water surface area expanded over all three decades with strong spatial and temporal difference,despite the drier and warmer climate background;although lakes comprise the largest portion of the surface water area,the highest contributor of surface water expansion was new constructed reservoir located in the densely populated region;climatic parameters alteration,like precipitation and temperature,resulted in the water surface expansion in the northwestern basin by growing water input linked with rain and glacier melting;in the rest part of China,rise of water surface area was predominately attributed to human relocation of water resource,which yielded more new water storage area than the disappeared water body caused by less precipitation and stronger *** conclusions highlight the integrative water resource management,especially in water conservation and restoration.

关键词： temporal dynamics spatial variation surface water area expansion driving forces

A deep learning network for estimation of seismic local slopes

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Petroleum Science 2021年第1期18卷 92-105页

作者： Wei-Lin Huang Fei Gao Jian-Ping Liao Xiao-Yu chuai State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijig 100083China Hunan Provincial Key Laboratory of Shale Gas Resource Utilization Hunan University of Science and TechnologyXiangtan 411201China Hebei Coal Research Institute Co. LtdJizhong Energy GroupXingtai 054000China

The local slopes contain rich information of the reflection geometry,which can be used to facilitate many subsequent procedures such as seismic velocities picking,normal move out correction,time-domain imaging and structural *** the slope estimation is achieved by manually picking or scanning the seismic profile along various *** present here a deep learning-based technique to automatically estimate the local slope map from the seismic *** the presented technique,three convolution layers are used to extract structural features in a local window and three fully connected layers serve as a classifier to predict the slope of the central point of the local window based on the extracted *** deep learning network is trained using only synthetic seismic data,it can however accurately estimate local slopes within real seismic *** examine its feasibility using simulated and real-seismic *** estimated local slope maps demonstrate the succes sful performance of the synthetically-trained network.

关键词： Deep learning Neural network Seismic data Local slopes