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Carbon-based materials for electrochemical dechlorination

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Nano Research 2023年第11期16卷 12543-12557页

作者： Guoqiang gan Guo Hong Wenjun Zhang Center of Super-Diamond and Advanced Films(COSDAF) Department of Materials Science and EngineeringCity University of Hong KongHong Kong 999077China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China

Electrochemical dechlorination reaction(EDR)is a promising,environmentally friendly,and economically profitable technology for treating chlorinated organic *** efficient environmental protection,electrocatalysts with high stability and low cost are of extremely significance to the development of EDR ***-based materials have aroused broad interest as electrocatalysts for many electrochemical reactions due to their characteristics including large specific surface area,controllable structure,good conductivity,and chemical *** EDR,the carbon-based materials also show many unique superiorities,like strong adsorption capacity to chlorinated organic compounds(COCs),excellent catalytic activity and stability,and environmental *** review starts with a detailed summary on the mechanisms of electrochemical dechlorination(direct and indirect electron transfer pathway)and factors affecting the effectiveness of *** the paper comprehensively overviews the current progresses of carbon-based materials for EDR of COCs,following their two major application scenarios,i.e.,directly as electrocatalysts and as advanced supports for other ***,the formation of different active sites in carbon-based electrocatalysts and their EDR activities are ***,the current challenges and perspectives in this field are *** review will provide an in-depth understanding for the design of advanced carbon-based materials and promote the development of EDR technology.

关键词： carbon-based electrocatalysts carbon supports electrochemical dechlorination chlorinated organic compounds mechanism active sites

Mixed Conduction in BaCe0.8Pr0.2O3-α Ceramic

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Chinese Journal of Chemical Physics 2008年第3期21卷 286-290页

作者： Mao-yuan Wang Li-gan Qiu School of Chemistry and Chemical Engineering Yancheng Teachers College Yancheng 224051 China

BaCe0.8Pr0.2O3-α ceramic was synthesized by high temperature solid-state reaction. The structural characteristics and the phase purity of the crystal were determined using powder X-ray diffraction analysis. By using the methods of AC impedance spectroscopy, gas concentration cell and electrochemical pumping of hydrogen, the conductivity and ionic transport number of BaCe0.8Pr0.2O3-α were measured, and the electrical conduction behavior of the material was investigated in different gases in the temperature range of 500-900℃. The results indicate that the material was of a single perovskite-type orthorhombic phase. From 500℃ to 900 ℃, electronic-hole conduction was dominant in dry and wet oxygen, air or nitrogen, and the total conductivity of the material increased slightly with increasing oxygen partial pressure in the oxygen partial pressure range studied. Ionic conduction was dominant in wet hydrogen, and the total conductivity was about one or two orders of magnitude higher than that in hydrogen-free atmosphere （oxygen, air or nitrogen）

关键词： BaCe0.8Pr0.2O3-α AC impedance Gas concentration cell Electrochemical pumping of hy-drogen Mixed conduction

SEOT: Secure dynamic searchable encryption with outsourced ownership transfer

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Frontiers of Computer Science 2023年第5期17卷 165-177页

作者： Jianwei LI Xiaoming WANG Qingqing gan Department of Information Science and Technology Jinan UniversityGuangzhou 510632China Department of Cyber Security Guangdong University of Foreign StudiesGuangzhou 510006China

When one enterprise acquires another,the electronic data of the acquired enterprise will be transferred to the acquiring *** particular,if the data system of acquired enterprise contains a searchable encryption mechanism,the corresponding searchability will also be *** this paper,we introduce the concept of Searchable Encryption with Ownership Transfer(SEOT),and propose a secure SEOT *** on the new structure of polling pool,our proposed searchable encryption scheme not only achieves efficient transfer of outsourced data,but also implements secure transfer of data ***,we optimize the storage cost for user to a desirable *** prove our scheme can achieve the secure characteristics,then carry out the performance evaluation and *** results demonstrate that our scheme is superior in efficiency and practicability.

关键词： cloud computing ownership transfer searchable encryption forward secure outsourced computation

Effects of surface roughness on CMAS corrosion behavior for thermal barrier coating applications

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Journal of Advanced Ceramics 2021年第3期10卷 472-481页

作者： Lei GUO Guang LI Zhilin gan School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin 300072China

Calcium-magnesium-alumina-silicate (CMAS) corrosion is an important cause for thermal barrier coating (TBC) failure,which has attracted increased *** this study,some thermal barrier coating (TBC) materials including YSZ (yttria partially stabilized zirconia),GdPO_(4),and LaPO_(4) were prepared into bulks,and the effects of their surface roughness on wettability and spreading characteristics of molten CMAS were ***-fabricated and polished bulks with different surface roughness were exposed to CMAS corrosion at 1250 ℃ for 1 and 4 h,following by macro and micro *** revealed that compared with the as-fabricated bulks,molten CMAS on the polished samples had lower wettability and a smaller spreading area,mainly attributable to the reduced capillary force to drive the melt ***,GdPO_(4) and LaPO_(4) bulks exhibited lower CMAS wettability than YSZ *** is thus considered that reducing the surface roughness is beneficial to CMAS corrosion resistance of TBCs.

关键词： thermal barrier coating(TBC) calcium-magnesium-alumina-silicate(CMAS) surface roughness wetting spreading

Smart Local Energy Systems Towards Net Zero:Practice and Implications from the UK

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 411-419页

作者： Jianzhong Wu Yue Zhou Wei gan School of Engineering Cardiff UniversityCardiff CF243AAWalesUK.

In transition towards net-zero carbon emissions,a high penetration of renewable power generation and electrification of heat and transport at the grid edge will increase total and peak power consumption significantly with greater uncertainties,thus posing serious challenges to electric power *** local energy systems,which manage distributed energy resources locally with various smart technologies and commercial arrangements,are one of the promising solutions to this *** paper provides a comprehensive review and analysis of the practice of local energy systems in the UK in the context of net-zero *** the macro level,local conditions,local businesses,profitability,investment and whole electricity system impacts of local energy systems are ***,a practical case in North Wales,UK,is analyzed for demonstrating technical,commercial and regulatory arrangements available and needed for setting up a local energy system *** are summarized for providing a useful reference for developing smart local energy systems within and beyond the UK.

关键词： Distributed energy resource microgrid net zero smart local energy system smart grid

Existence of positive solutions with peaks on a Clifford torus for a fractional nonlinear Schrodinger equation

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Science China Mathematics 2019年第9期62卷 1731-1748页

作者： Weiming Liu Lu gan School of Mathematics and Statistics Hubei Normal University

We consider the fractional nonlinear Schr?dinger equation in this paper. Applying the finite reduction method, we prove that the equation has positive solutions with peaks on a Clifford torus under some suitable condi... 详细信息

关键词： fractional nonlinear Schrodinger equation reduction method Clifford torus

Compressible Limit of the Nonlinear Schrdinger Equation with Different-Degree Small Parameter Nonlinearities

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Chinese Annals of Mathematics,Series B 2011年第1期32卷 105-122页

作者： Zaihui gan Boling GUO College of Mathematics and Software Science Sichuan Normal University Chengdu 610068 China Institute of Applied Physics and Computational Mathematics PO Box 8009 Beijing 100088 China Institute of Applied Physics and Computational Mathematics PO Box 8009 Beijing 100088 China

The authors study the compressible limit of the nonlinear Schrdinger equation with different-degree small parameter nonlinearities in small time for initial data with Sobolev regularity before the formation of singularities in the limit *** the one hand,the existence and uniqueness of the classical solution are proved for the dispersive perturbation of the quasi-linear symmetric system corresponding to the initial value problem of the above nonlinear Schrdinger *** the other hand,in the limit system,it is shown that the density converges to the solution of the compressible Euler equation and the validity of the WKB expansion is justified.

关键词： Nonlinear Schrdinger equation Compressible limit Compressible Euler equation WKB expansion

Forkhead-associated domain 2 links light signal to miRNA biogenesis

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Molecular Plant 2021年第4期14卷 541-543页

作者： Lu gan Bin Yu School of Biological Sciences&Center for Plant Science Innovation University of Nebraska-LincolnLincolnNE 68588-0666USA

MicroRNAs(miRNAs)are one of the most important regulators of gene *** biogenesis starts with the transcription of primary miRNA transcripts(pri-miRNAs).In plants,the RNase Ⅲ enzyme DICER-LIKER 1(DCL1),together with its partner,the double-stranded RNA-binding protein HYPONASTIC LEAVES 1(HYL1),and the zinc-finger protein SERRATE(SE),process the imperfect miRNA-residing stem loop of pri-miRNAs to release the miRNA/miRNA*duplexes in the nucleus,which are then methylated by HUA1 ENHANCER 1(Rogers and Chen,2013;Song et al.,2019).Then,most miRNAs are sorted into AGONAUTE 1 to mediate mRNA-cleavage or translation inhibi-tion based on sequence complementarity(Rogers and Chen,2013;Song et al.,2019).Studies have shown that miRNA biogenesis is controlled through modulating pri-miRNA transcription,stability and processing,which is often coupled with various developmental and environmental signals.

关键词： expression. genesis release

Ventilation of the Sulu Sea retrieved from historical data

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Acta Oceanologica Sinica 2014年第9期33卷 1-11页

作者： LI Li gan Zijun Third Institute of Oceanography State Oceanic Administration State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanoglogy

Based on historical observations, ventilation of the Sulu Sea （SS） is investigated and, its interbasin exchange is also partly discussed. The results suggest that near the surface the water renewal process not only occurs through the Mindoro Strait （MS） and the Sibutu Passage, but also depends on the inflows through the Surigao Strait and the Bohol Sea from the Pacific and through the Balabac Strait from the South China Sea （SCS）. Both inflows are likely persistent year round and their transports might not be negligible. Below the surface, the core layer of the Subtropical LowerWater （SLW） lies at about 200 m, which enters the SS through the Mindoro Strait not hampered by topography. Moreover, there is no indication of SLW inflow through the Sibutu Passage even though the channel is deep enough to allow its passage. The most significant ventilation process of the SS takes place in depths from 20a m to about 1200 m where intermediate convection driven by quasi-steady inflows through the Mindoro and Panay straits （MS-PS） dominates. Since the invaded water is drawn from the upper part of the North Pacific Intermediate Water （NPIW） of the SCS, it is normally not dense enough to sink to the bottom. Hence, the convective process generally can only reach some intermediate depths resulting in a layer of weak salinity minimum （about 34.45）. Below that layer, there is the Sulu Sea Deep Water （SSDW） homogeneously distributed from 1200 m down to the sea floor, of which the salinity is only a bit higher （about 34.46） above the minimum. Observational evidence shows that hydrographic conditions near the entrance of the MS in the SCS vary significantly from season to season, which make it possi- ble to provide the MS-PS overflowwith denser water of higher salinity sporadically. It is hence proposed that the SSDW is derived from intermittent deed convection resulted from DroDertv changes of the MS-PS inflow.

关键词： Sulu Sea ventilation overflow interbasin exchange