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| 1 | Kilometers Long Graphene-Coated Optical Fibers for Fast Thermal Sensing显示文摘The combination of optical fiber with graphene has greatly expanded the application regimes of fiber optics,from dynamic optical control and ultrafast pulse generation to high precision sensing.However,limited by fabrication,previous graphene-fiber samples are typically limited in the micrometer to centimeter scale,which cannot take the inherent advantage of optical fibers—longdistance optical transmission.Here,we demonstrate kilometers long graphene-coated optical fiber(GCF)based on industrial graphene nanosheets and coating technique.The GCF shows unusually high thermal diffusivity of 24.99 mm^(2) s^(-1) in the axial direction,measured by a thermal imager directly.This enables rapid thermooptical response both in optical fiber Bragg grating sensors at one point(18-fold faster than conventional fiber)and in long-distance distributed fiber sensing systems based on backward Rayleigh scattering in optical fiber(15-fold faster than conventional fiber).This work realizes the industrial-level graphene-fiber production and provides a novel platform for two-dimensional material-based optical fiber sensing applications. | Yiyong Guo Bing Han Junting Du Shanshan Cao Hua Gao Ning An Yiwei Li Shujie An Zengling Ran Yue Lin Wencai Ren Yunjiang Rao Baicheng Yao | 2021 | Research2021，，1： | 2 |
| 2 | High-speed train cooperativecontrol based on fractional-ordersliding mode adaptive algorithm显示文摘Purpose–This study aims to propose an adaptive fractional-order sliding mode controller to solve the problem of train speed tracking control and position interval control under disturbance environment in moving block system,so as to improve the tracking efficiency and collision avoidance performance.Design/methodology/approach–The mathematical model of information interaction between trains is established based on algebraic graph theory,so that the train can obtain the state information of adjacent trains,and then realize the distributed cooperative control of each train.In the controller design,the sliding mode control and fractional calculus are combined to avoid the discontinuous switching phenomenon,so as to suppress the chattering of sliding mode control,and a parameter adaptive law is constructed to approximate the time-varying operating resistance coefficient.Findings–The simulation results show that compared with proportional integral derivative(PID)control and ordinary sliding mode control,the control accuracy of the proposed algorithm in terms of speed is,respectively,improved by 25%and 75%.The error frequency and fluctuation range of the proposed algorithm are reduced in the position error control,the error value tends to 0,and the operation trend tends to be consistent.Therefore,the control method can improve the control accuracy of the system and prove that it has strong immunity.Originality/value–The algorithm can reduce the influence of external interference in the actual operating environment,realize efficient and stable tracking of trains,and ensure the safety of train control. | Junting Lin Mingjun Ni Huadian Liang | 2023 | Railway Sciences2023，2，1： | 0 |
| 3 | A robust & weak-nucleophilicity electrocatalyst with an inert response for chlorine ion oxidation in large-current seawater electrolysis显示文摘Seawater splitting into hydrogen,a promising technology,is seriously limited by the durability and tolerance of electrocatalysts for chlorine ions in seawater at large current densities due to chloride oxidation and corrosion.Here,we present a robust and weak-nucleophilicity nickel-iron hydroxide electrocatalyst with excellent selectivity for oxygen evolution and an inert response for chlorine ion oxidation which are key and highly desired for efficient seawater electrolysis.Such a weak-nucleophilicity electrocatalyst can well match with strong-nucleophilicity OH-compared with the weak-nucleophilicity Cl^(-),resultantly,the oxidation of OH-in electrolyte can be more easily achieved relative to chlorine ion oxidation,confirmed by ethylenediaminetetraacetic acid disodium probing test.Further,no strongly corrosive hypochlorite is produced when the operating voltage reaches about 2.1 V vs.RHE,a potential that is far beyond the thermodynamic potential of chlorine ion oxidatio n.This concept and approach to reasonably designing weaknucleophilicity electrocatalysts that can greatly avoid chlorine ion oxidation under alkaline seawater environments can push forward the seawater electrolysis technology and also accelerate the development of green hydrogen technique. | Junting Dong Chang Yu Hui Wang Lin Chen Hongling Huang Yingnan Han Qianbing Wei Jieshan Qiu | 2024 | Journal of Energy Chemistry2024，90，3： | 0 |
| 4 | Controllable surface reconstruction of copper foam for electrooxidation of benzyl alcohol integrated with pure hydrogen production显示文摘Electrocatalytic water splitting that is coupled with electrocatalytic chemical oxidation is considered as one of the promising methods for efficiently obtaining hydrogen energy and fine chemicals.Herein,we focus on an electrochemical redox activation strategy to rationally manipulate the microstructure and surface valence states of copper foam(CF)and boost the corresponding performance towards electrocatalytic benzyl alcohol oxidation(EBA),accompanied by the efficient hydrogen production.Correspondingly,the Cu(II)‐dominated species are gradually formed on the CF surface with the dissolution and redeposition of copper in the suitable potential range.The new species containing Cu2O,CuO,and Cu(OH)2 during surface reconstruction process of the CF were confirmed by multiple characterization techniques.After 220‐cycled activation(CF‐220),the activated CF achieves an increase of current density for EBA in anode from 9.5 for the original CF to 29.3 mmol/cm2,while the pure hydrogen yield increases threefold than that of the original CF at 1.5 VRHE.The produced new species can endow the CF‐220 with abundant acidity sites,which can enhance the adsorption toward Lewis‐basicity benzyl alcohol,confirmed by NH3‐temperature‐programmed desorption.In situ Raman result further reveals that the as‐produced CuO,Cu(OH)2,and Cu(OH)42−are the main active species toward the EBA process. | Yingnan Han Chang Yu Hongling Huang Qianbing Wei Junting Dong Lin Chen Jieshan Qiu | 2024 | SmartMat2024，5，1： | 0 |
| 5 | Fabricating amide functional group modified hyper-cross-linked adsorption resin with enhanced adsorption and recognition performance for 5-hydroxymethylfurfural adsorption via simple one-step显示文摘In this study,three kinds of amide functional group modified hyper-cross-linked adsorption resin were synthesized by alternating radical copolymerization in simple one-step and applied for 5-hydroxymethylfurfural(5-HMF)adsorption.The successful synthesis and properties of adsorbents were evaluated with Fourier transform infrared spectroscopy,scanning electron microscopy,nitrogen adsorption-desorption isotherms,thermogravimetric analysis,and elemental analysis.Poly(N,N’-4,4’-diphenyl methane-bismaleimide-alt-divinylbenzene)(poly(BDM-alt-DVB))resin exhibited highest adsorption capacity for 5-HMF(64.0 mg·g^(-1)wet resin)and excellent adsorption selectivity(a_(5-HMF/LA)=2.71±0.12,α_(5-HMF/FA)=13.88±0.15,α_(5-HMF/Glucose)=11.91±1.11)in the multi-component solution at 25℃.Langmuir isotherm model well fitted the equilibrium adsorption data within the initial 5-HMF concentration range of 0.5-10.0 g·L^(-1) with highest correlation coefficient.Furthermore,the thermodynamic parameters demonstrated that the adsorption of 5-HMF onto poly(BDM-alt-DVB)resin was spontaneous and exothermic.Kinetic study revealed that the adsorption process was fast,reaching equilibrium within12 min.Importantly,the poly(BDM-alt-DVB)resin also demonstrated excellent reusability.In summary,the poly(BDM-alt-DVB)resin will be useful in 5-HMF hydrolysate separation applications. | Lei Hu Shunhui Tao Junting Xian Xiaodong Zhang Yao Liu Xiaojie Zheng Xiaoqing Lin | 2022 | Chinese Journal of Chemical Engineering2022，35，3： | 0 |
| 6 | Enhanced water-induced effects enabled by alkali-stabilized Pd-OH_(x) species for oxidation of benzyl alcohol显示文摘The water promotion effects,where water can provide a solution-mediated reaction pathway in various heterogeneous chemical catalysis,have been presented and attracted wide attention recently,yet,the rational design of catalysts with a certain ability of enhancing water-induced reaction process is full of challenges and difficulties.Here,we show that by incorporating alkali(Na,K)cations as an electronic and/or structural promoter into Pd/rGO-ZnCr_(2)O_(4)(r GO,reduced graphene oxide),the obtained Pd(Na)/rGO-ZnCr_(2)O_(4)as a representative example demonstrates an outstanding benzyl alcohol oxidation activity in the Pickering emulsion system in comparison to the alkali-free counterpart.The response experiments of water injection confirm the enhanced activity,and the Na-modified catalyst can further enhance the promotion effects of water on the reaction.The effects of alkali cations for Pd nanoparticles are identified and deciphered by a series of experimental characterizations(XPS,in situ CO-DRIFTS,and CO-TPR coupled with MS),showing that there is abundant-OH on the surface of the catalyst,which is stabilized by the formation of Pd-OH_(x).The alkali-stabilized Pd-OH_(x)is helpful to enhance the waterinduced reaction process.According to the results of in situ Raman as well as UV-vis absorption spectra,the Na-modulated Pd(Na)/rGO-ZnCr_(2)O_(4)enables the beneficial characteristics for distorting the benzyl alcohol structure and enhancing the adsorption of benzyl alcohol.Further,the mechanism for enhanced water promotion effects is rationally proposed.The strategy of alkali cations-modified catalysts can provide a new direction to effectively enhance the chemical reaction involving small molecule water. | Qianbing Wei Chang Yu Yongwen Ren Lin Ni Dongming Liu Lin Chen Hongling Huang Yingnan Han Junting Dong Jieshan Qiu | 2023 | Chinese Chemical Letters2023，34，6： | 0 |
| 7 | Discussion and Practice of Blended Teaching in Basic Theory and Application of GSM-R显示文摘In order to accommodate the trend of high-speed railway signaling integrating with communication techniques,Basic Theory and Application of GSM-R is a crucial curriculum for students majoring in Traffic Information Engineering and Control and Transportation Engineering.It helps students to master the latest theory and application of train-ground communication techniques.However,with the application of the next generation railway mobile communication technique,several advanced communication techniques are presented in the form of English materials.It is of great significance to have a bilingual teaching mode for this course.This would contribute to cultivating research-oriented and professional talents with international competitiveness.Through the blended teaching reform of bilingual education,the proportion of topic selection of interdisciplinary research papers by postgraduates has increased from 6%to 15%.In this article,the characteristics and the current problems of bilingual teaching are discussed from theory to practice in three aspects:the production of bilingual courseware,the supplement of English materials,and the guidance of research topics.Additionally,corresponding teaching reform schemes are proposed in this article. | Junting Lin Weifang Wang Jinchuan Chai | 2021 | Journal of Contemporary Educational Research2021，5，11： | 0 |
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