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Journal of Analysis and Testing 2023年第1期7卷 1-7页

作者： heng-gan li Yi-Men Zhu Xue-lian liu Zhi-Yong Guo Ya-Ning Huang Xi Chen Department of Civil Engineering and Architecture Wuyi UniversityWuyishan 354300China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361005China Institute of Analytical Technology and Smart Instruments and College of Environment and Public Healthy Xiamen Huaxia UniversityXiamen 361024China Information Center Xiamen Huaxia UniversityXiamen 361024China

In this study,the halogen exchange reactions are investigated between KI or methylamine iodide in aqueous solution and CsPbBr_(3)NCs in *** mass transfer process on the interface between water and toluene affects the halogen exchange time and e *** and heating can effectively improve the halogen exchange e fficiency and increases the sensing *** photoluminescence wavelength shift of CsPbBr_(3)NCs shows good linear relationship with the concentration of I-in the range from 0 to 20 nmol/L with the detection limit of 0.2 nmol/L I^(-).Taking H_(2)O_(2)as a typical water-soluble oxide,the method is applied to the colorimetric sensing of H_(2)O_(2)in water *** the optimization of sensing conditions,the obvious wavelength shift could be observed with the different concentration range of H_(2)O_(2).A good linear relationship between the wavelength shift and the H_(2)O_(2)concentration from 0 to 1.0 mmol/L with the detection limit of 0.05 mmol/L H_(2)O_(2)could be found.

关键词： Halogen exchange Interface reaction CsPbBr_(3)perovskite nanocrystals Photoluminescence wavelength shift Colorimetric sensing

Preparation of porous (Mo2/3Y1/3)2AlC and its hydrogen evolution reaction performance

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Progress in Natural Science:Materials International 2024年第5期34卷 1100-1107页

作者： Siwei Tan Junsheng Yang Jie li gan Xiao Baogang Wang Wenkai Jiang heng Zhang Xuejin Yang School of Mechanical Engineering Wuhan Polytechnic University

Porous(Mo2/3Y1/3)2AlC MAX phase ceramic was prepared by reaction sintering method using Mo, Y, Al, and graphite powder as raw materials. The influence of changes in Al content on the purity of the obtained samples was investigated using X-ray diffraction（XRD）, scanning electron microscopy（SEM）, Archimedes method, and bubble point method. The conditions for obtaining a pure phase were identified, and the transformation path of the phase during sintering and the mechanism of pore formation were provided. The linear sweep voltammetry（LSV） cure and cyclic voltammetry（CV） cure of MAX were tested using an electrochemical workstation. It can be calculated that MAX exhibits good hydrogen evolution reaction（HER） performance under alkaline conditions due to its high electrochemical active surface area（ECSA） of 373.2 and small Tafel slope of 41.7 mV·dec-1.

关键词： Porous material (Mo 2/3 Y 1/3 ) 2 AlC Pore forming mechanism HER

Photonic crystal cavities and integrated optical devices

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Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 11-22页

作者： gan lin li ZhiYuan Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences

This paper gives a brief introduction to our recent works on photonic crystal(Ph C) cavities and related integrated optical structures and devices. Theoretical background and numerical methods for simulation of Ph C cavities are first presented. Based on the theoretical basis, two relevant quantities, the cavity mode volume and the quality factor are discussed. Then the methods of fabrication and characterization of silicon Ph C slab cavities are introduced. Several types of Ph C cavities are presented, such as the usual L3 missing-hole cavity, the new concept waveguide-like parallel-hetero cavity, and the low-index nanobeam cavity. The advantages and disadvantages of each type of cavity are discussed. This will help the readers to decide which type of Ph C cavities to use in particular applications. Furthermore, several integrated optical devices based on Ph C cavities, such as optical filters, channel-drop filters, optical switches, and optical logic gates are described in both the working principle and operation characteristics. These devices designed and realized in our group demonstrate the wide range of applications of Ph C cavities and offer possible solutions to some integrated optical problems.

关键词： photonic crystal cavities optical filter optical switch optical logic gates

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

Supramolecular polymer network constructed by a functionalized polyimidazolium salt derived from metal-carbene template approach

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Science China Chemistry 2024年第4期67卷 1224-1228页

作者： Ming-Ming gan Zi-En Zhang Yi-Fan Zhang heng Zhang li-Ying Sun Ying-Feng Han Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education Xi’an Key Laboratory of Functional Supramolecular Structure and MaterialsCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China

In this study,we present a supramolecular templating approach for constructing polyimidazolium salt containing crown ether and cyclobutane *** strategy involves the formation of metal-carbene templates,photochemical cycloaddition,and subsequent demetallation of metal *** by the host-guest chemistry between crown ether units and ammonium salts,we successfully fabricated a supramolecular polymer SPN1,which features imidazolium receptors and cyclobutane *** obtained SPN1 demonstrates outstanding reversible stimulus-response,antibacterial behavior and conductivity.

关键词： metal-carbene template crown ether polyimidazolium salt host-guest chemistry

Slicing-response model for ablation mass removal of polyformaldehyde irradiated by pulsed CO_2 laser in vacuum

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Science China(Technological Sciences) 2015年第1期58卷 158-162页

作者： li gan Cheng MouSen li XiaoKang National University of Defense Technology College of Aerospace Science and Engineering

The interaction between CO2 laser and polyformaldehyde(POM)is quite important in the research of laser irradiation effects and *** this time,the accuracy of the existing mass-ablation models for POM irradiated by CO2 laser is poor compared with the experimental *** on the energy distribution deposited in the POM target,the active area excited by laser is divided into four slices,the ablation slice(the temperature-rising slice,the perturbation slice,and the undisturbed slice),and a slicing response model for the mass ablation of POM induced by pulsed CO2 laser irradiation in vacuum is developed.A formula is deduced to predict the ablated mass areal density from the model and is verified with data from several studies and our own *** results show that our model fits the experimental data quite well before the shielding effect of ablation products becomes *** applicability of the model to other materials and the mass ablation in atmosphere are also briefly explored.

关键词： laser ablation pulsed CO2 laser polyformaldehyde(POM) ablation model

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

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

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

Review on residual stress and its effects on manufacturing of aluminium alloy structural panels with typical multi-processes

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Chinese Journal of Aeronautics 2023年第5期36卷 96-124页

作者： Yong li Wanni gan Wenbin ZHOU Dongsheng li School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Shenzhen Institute of Beihang University Shenzhen 518057China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant *** manufacture these panels as integrity with high accuracy,multiple processes need to be utilised,such as machining,welding and *** the whole manufacturing chain,residual stresses can be generated and redistributed in the components among different *** residual stress would significantly affect the shapes and properties of the final ***,these great effects are not well considered in the design and manufacturing *** paper aims to draw a general understanding of the residual stress generated in the pre-manufacturing processes and its effects on subsequent manufacturing *** mechanisms and distributions of residual stresses generated in typical premanufacturing processes of structural panels,including machining,welding and additive manufacturing(AM),are firstly *** detailed effects of generated residual stresses on distortion and application properties in subsequent manufacturing processes are then *** addition,current methods developed for the investigation of residual stress effect in multi-processes manufacturing are critically reviewed,including experimental,analytical,finite element(FE)and machine learning ***,the future development trend of methods for residual stress consideration and control in the design of manufacturing processes is summarised,providing comprehensive guidance to achieve the high accurate manufacturing of aluminium alloy structural components.

关键词： Residual stress Stiffened panel Aluminium alloy Multi-processes manufacturing Machining Welding Additive manufacturing