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Sulfur-doped g-C_(3)N_(4)/g-C_(3)N_(4) isotype step-scheme heterojunction for photocatalytic H_(2) evolution

Journal of materials Science & Technology 2022年第23期118卷 15-24页

作者： Jizhou Jiang Zhiguo Xiong Haitao Wang Guodong Liao Saishuai Bai Jing Zou Pingxiu Wu Peng Zhang Xin Li School of Environmental Ecology and Biological engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China Key Laboratory of Rare Mineral Ministry of Natural ResourcesGeological Experimental Testing Center of Hubei ProvinceWuhan 430034China Semiconductor Electronic Special Gas of Hubei engineering Research center Jingzhou 434000China Institute of Biomass engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China State Centre for International Cooperation on Designer Low-Carbon&Environmental materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The rational fabrication of an efficient heterojunction is critical to the enhancement of photocatalytic hydrogen(H_(2)) evolution ***,a new-fashioned graphitic-carbon nitride(g-C_(3) N_(4)) based isotype step-scheme(S-scheme) heterojunction composed of sulfur-doped and sulfur-free active sites is developed by liquid sulfur-mediation of exfoliated g-C_(3) N_(4).Particularly,the liquid sulfur not only contributes to the full contact between sulfur species and exfoliated g-C_(3) N_(4),but also creates sulfur-doping and abundant pores,since self-gas foaming effect of sulfur ***,the S-doped and S-free active sites located in the structural unit of C_(3) N_(4) jointly construct a typical sulfur-doped g-C_(3) N_(4)/g-C_(3) N_(4) isotype step-scheme heterojunction,which endows highly efficient photocatalytic reaction ***,the optimal sample possesses remarkable photocatalytic H_(2) evolution activity(5548.1 μmol g^(-1) h^(-1)) and robust *** importantly,the investigation will open up a new path for the exploration of other carbon-based isotype S-scheme heterojunctions.

关键词： Liquid sulfur S-doping g-C_(3)N_(4) Isotype S-scheme heterojunction Photocatalytic H_(2) evolution

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Suppression to the cross-channel interference based on the short time Fourier transform

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High Technology Letters 2013年第3期19卷 309-314页

作者：何密 Nian Yongjian Li Yongzhen Xiao Shunping School of Biomedical engineering Third Military Medical University and Chongqing University School of Electronic Science and engineering National University of Defense Technology

A new cross-channel interference suppression method is proposed to decrease the cross-channel interference in beat signals based on the short time Fourier transform （STY3＂） and the inverse short time Fourier transform （ISTFT） when the dual-orthogonal polarimetric frequency-modulated continu- ous wave （FMCW） radar adopts the opposite-slope linear frequency modulation signal pair in the simultaneous measurement mode. The STFT is applied only on the signals in the cross-interference intervals in the four polarimetric channels to decrease the computation complexity. A mask matrix for suppressing the interference is constructed using the constant false alarm ratio （CFAR） detection on the spectrograms by the STFY. The simulative results show that the cross-channel interference is effi- ciently suppressed by the proposed method. The comparison between the proposed method and the rejection method verifies the improved performance of the proposed method.

关键词： simultaneous measurement cross-channel interference suppression the short timeFourier transform (STFT) the inverse short time Fourier transform (ISTFT)

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Breakdown of Raman selection rules by Frohlich interaction in few-layer WS_(2)

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Nano Research 2021年第1期14卷 239-244页

作者： Qing-Hai Tan Yu-Jia Sun Xue-Lu Liu Kai-Xuan Xu Yuan-Fei Gao Shu-Liang Ren Ping-Heng Tan Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsCenter of Materials Science and Optoelectronics EngineeringCAS Center of Excellence in Topological Quantum ComputationUniversity of Chinese Academy of SciencesBeijing 100083China Beijing Academy of Quantum Information Science Beijing 100193China

The polarization selection rule of Raman scattering is crucial in symmetry analysis of elementary excitations in semiconductors and correlated electron *** we reported the observation of breakdown of Raman selection rules in few-layer WS_(2) by using resonant Raman *** the excitation energy is close to the dark A exciton state,we observed some infrared active modes and backscattering forbidden ***,we found that all observed phonon modes follow the same paralleled-polarization *** to the electron-phonon coupling near the band edge in WS_(2),we proposed a theoretical model based on the intraband Frohlich *** this case,the polarization response of the scattering signal is no longer determined by the original Raman tensor of scattered ***,it is determined by a new isotropic Raman tensor that generated from this intraband Frohlich interaction between dark A exciton and *** found that this theoretical model is in excellent agreement with the observed *** breakdown of Raman selection rules can violate the conventional limitations of the optical response and provide an effective method to control the polarization of Raman scattering signals in two-dimensional materials.

关键词： WS_(2) resonant Raman scattering dark exciton Raman section rules Frohlich interaction

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Improvement of wood properties by composite of diatomite and “phenol-melamine-formaldehyde” co-condensed resin

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Journal of Forestry Research 2013年第4期24卷 741-746页

作者： ZHANG Ming XU Yang WANG Shu-liang SHI Jun-you LIU Chang-yu WANG Cheng-yu College of materials Science and engineering Northeast Forestry University China Nation center for Quality Supervision and Test of Wood working Machinery Northeast Forestry University Wood Material Science and engineering Key Laboratory of Jilin Province Beihua University

We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method. The fast-growing poplar was modified by a vacuum-pressure impregnation method with three types of modification solutions composed of phe- nol-melamine-formaldehyde （PMF） co-condensed resin, diatomite, and 3-aminopropyl （diethoxy） methylsilane. We measured the weight percent gain （WPG）, bulking, leaching, anti-swelling efficiency （ASE）, wa- ter-repellent effectiveness （WRE）, and oxygen index of the modified specimens. All of the wood physical properties, which are beneficial for human uses, were significantly improved by the treatment. We improved various characteristics of wood and the oxygen index of poplar above 48.6% after the modification using diatomite and PMF co-condensed resin.

关键词： Keywords: wood modification phenol-melamine-formaldehydeco-condensed resin artificial fast-growing poplar diatomite

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Multi‑compartment Organ‑on‑a‑Chip Based on Electrospun Nanofber Membrane as In Vitro Jaundice Disease Model

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Advanced Fiber materials 2021年第6期3卷 383-393页

作者： Fan Lei Minhua Liang Yang Liu Hanhao Huang Haofei Li Hua Dong Department of Biomedical engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510006China National engineering Research center for Tissue Restoration and Reconstruction(NERC-TRR) Guangzhou 510006China Key Laboratory of Biomedical materials and engineering of the Ministry of Education South China University of TechnologyGuangzhou 510006People’s Republic of China Guangdong Province Key Laboratory of Biomedical engineering South China University of TechnologyGuangzhou 510641China

Organ-on-a-chip(OOC)is now becoming a potential alternative to the classical preclinical animal models,which reconstitutes in vitro the basic function of specifc human tissues/organs and dynamically simulates physiological or pathological activities in tissue and organ *** of the much progress achieved so far,there is still an urgent need to explore new biomaterials to construct a reliable and efcient tissue-tissue interface and a general fabrication strategy to expand from single-organ OOC to multi-organ OOC in an easy *** this paper,we propose a novel strategy to prepare doublecompartment organ-on-a-chip(DC-OOC)using electrospun poly(l-lactic acid)/collagen I(PLLA/Col I)nanofber membrane as tissue-tissue *** unique features of PLLA/Col I nanofber membrane like excellent biocompatibility,strong afnity to multiple cells,adjustable orientation,controllable thickness and porosity endow the tissue-tissue interface with excellent semi-permeability,appropriate mechanical support,inducible cell orientation,good cell adhesion and *** integration of 3D printing technology during the fabrication process enables precise size control of the tissue-tissue interface and stable bonding with microfuidic *** importantly,our fabrication strategy and OOC confguration makes it easy to extend from DC-OOC to multi-compartment organ-on-a-chip(MC-OOC).To show its possible application,in vitro jaundice disease model is established by constructing blood vessel/skin/liver/lung organ-on-a-chip via *** downward trends of the cell viability after perfusion of bilirubin,the variation in cell sensitivity to bilirubin for diferent type of cells and recovery of cell viability after blue light therapy prove the feasibility of this jaundice disease *** believe this general strategy of constructing tissue-tissue interface and multi-organ OOC can be used for many other in vitro physiological and pathological models.

关键词： Multi-compartment organ-on-a-chip Electrospun nanofber Tissue–tissue interface 3D printing Jaundice disease

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Robust perfluorinated porous organic networks: Succinct synthetic strategy and application in chlorofluorocarbons adsorption

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Nano Research 2021年第9期14卷 3282-3287页

作者： Yali Luo Zhenzhen Yang Xian Suo Hao Chen Tao Wang Ziqian Wang Yunfei Liu Yinong Lyu llja Popovs Sheng Dai College of materials Science and engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Jiangsu Collaborative Innovation Center for Advanced Inorganic Function CompositesNanjing Tech UniversityNanjing 211816China Department of Chemistry The University of TennesseeKnoxvilleTN 37996USA Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

Fluorinated porous organic networks(F-PONs)have demonstrated unique properties and applications,but approaches capable of affording F-PONs with high fluorine content and robust nanoporous architecture under metal-free and easy handling conditions are still rarely ***,using polydivinylbenzene(PDVB)as an easily available precursor,a novel and straightforward approach was developed to afford F-PONs via a dehydrative Friedel-Crafts reaction using perfluorinated benzylic alcohols as the cross-linking agent promoted by Bronsted acid(trifluoromethanesulfonic acid).The afforded material(F-PDVB)featured high fluorine content(22 at.%),large surface area(771 m^(2)·g^(-1)),and good chemical/thermal stability,rendering them as promising candidates for the adsorption of CO_(2),hydrocarbons,fluorocarbons,and chlorofluorocarbons,with weight capacities up to 520 wt.%being *** simple methodology can be extended to fabricate fluorinated hyper-crosslinked polymers(F-HCPs)from rigid aromatic *** progress made in this work will open new opportunities to further expand the involvement of fluorinated materials in large scale applications.

关键词： fluorinated porous organic networks Friedel-Crafts reaction hyper-crosslinked polymers chlorofluorocarbons

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Improvement in hot corrosion resistance of dissimilar alloy 825 and AISI 321 CO2-laser weldment by HVOF coating in aggressive salt environment at 900℃

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International Journal of Minerals,Metallurgy and materials 2020年第11期27卷 1536-1550页

作者： S.M.Muthu M.Arivarasu T.Hari Krishna Supriyo Ganguly K.V.Phani Prabhakar Saurav Mohanty School of Mechanical engineering Vellore Institute of TechnologyVelloreTamil Nadu 632014India center for Innovative Manufacture Research Vellore Institute of TechnologyVelloreTamil Nadu 632014India Welding engineering and Laser Processing Centre Cranfield UniversityBedfordUnited Kingdom CLPM International Advanced Research Centre for Powder Metallurgy&New Materials(ARCI)HyderabadIndia Department of Mechanical engineering North Carolina State UniversityRaleighUSA

This study investigated the hot corrosion performance of a dissimilar weldment of Ni-based superalloy and stainless steel joined by CO2-laser welding and improved by high-velocity oxy-fuel(HVOF)coating in a Na2SO4-60wt%V2O5 environment at 900℃.A dissimilar butt joint of AISI 321 and alloy 825 was fabricated by CO2-laser welding with low heat input after obtaining the optimum welding parameters by bead-on-plate *** metallurgical and mechanical properties of the laser weldment were *** tensile test results indicated the occurrence of fracture in the base metal AISI 321 *** HVOF process was employed to coat Ni-20wt%Cr on the *** evaluate the surface morphology of the corrosion products formed on the uncoated and Ni-20wt%Cr-coated weldments,scanning electron microscopy(SEM)analysis was ***-dispersive spectroscopy(EDS)was used to determine the different elements present on the surface *** existence of oxide phases on the weldments was determined by X-ray diffraction(XRD).The cross sections of the weldments were characterized by SEM with EDS line mapping *** results indicated that the Ni-20wt%Cr-coated weldment exhibited superior hot corrosion resistance due to the development of Cr2O3 and NiCr2O4 protective oxide scales.

关键词： nickel-based superalloy dissimilar welding weldment corrosion high-velocity oxy-fuel coating corrosion kinetics

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An aperiodic phenomenon of the unscented Kalman filter in filtering noisy chaotic signals

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Progress in Natural Science:materials International 2007年第10期17卷 1235-1240页

作者： Fan Hongjuan1, Feng Jiuchao1,2, Xie Shengli2 and Wang Shiyuan1(1. Faculty of Electronic and Information engineering ,Southwest University, chongqing 400715, China 2. School of Electronic and Information engineering, South China University of Technology, Guangzhou 510641, China) Faculty of Electronic and Information engineering Southwest University Chongqing 400715 China School of Electronic and Information engineering South China University of Technology Guangzhou 510641 China

A non-periodic oscillatory behavior of the unscented Kalman filter (UKF) when used to filter noisy contaminated chaotic signals is reported. We show both theoretically and experimentally that the gain of the UKF may not converge or diverge but oscillate aperiodically. More precisely, when a nonlinear system is periodic, the Kalman gain and error covariance of the UKF converge to zero. However, when the system being considered is chaotic, the Kalman gain either converges to a fixed point with a magnitude larger than zero or oscillates aperiodically.

关键词： chaos unscented Kalman filter Lyapunov exponents aperiodicity.

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Aggregation-induced barrier to oxygen——a new AIE mechanism for metal clusters with phosphorescence

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National Science Review 2022年第8期9卷 71-79页

作者： Yan Jin Qiu-Chen Peng Si Li Hui-Fang Su Peng Luo Ming Yang Xin Zhang Kai Li Shuang-Quan Zang Ben Zhong Tang Thomas C.W.Mak Henan Key Laboratory of Crystalline Molecular Functional materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou University Shenzhen Institute of Aggregate Science and Technology School of Science and EngineeringChinese University of Hong Kong The Hong Kong Branch of the Chinese National engineering Research center for Tissue Restoration and Reconstruction Hong Kong University of Science and Technology Department of Chemistry Chinese University of Hong Kong

Metal clusters are useful phosphors, but highly luminescent examples are quite rare. Usually, the phosphorescence of metal clusters is hindered by ambient O2molecules. Transforming this disadvantage into an advantage for meaningful applications of metal clusters presents a formidable challenge. In this work, we used ligand engineering to judiciously prepare colour-tuneable and brightly emitting Cu(I)clusters that are ultrasensitive to O2upon dispersion in a fluid solution or in a solid matrix. When the O2scavenger dimethyl sulfoxide(DMSO) was used as the solvent, joint photo-and oxygen-controlled multicolour switches were achieved for the first time for metal cluster-based photopatterning and photo-anticounterfeiting. More importantly, an aggregation-induced barrier to oxygen, a new aggregation-induced emission mechanism for metal clusters, was proposed, providing a new pathway to realizing the intense emission of metal clusters in the aggregated state. These results are expected to promote the application of metal clusters and enrich the luminescence theory of metal cluster aggregates.

关键词： metal clusters aggregation-induced emission phosphorescence photoresponse O_2 detection

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Therapeutic potential and mechanism of functional oligosaccharides in inflammatory bowel disease: a review

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Food Science and Human Wellness 2023年第6期12卷 2135-2150页

作者： Xiaochun Yang Deyong Zeng Chongyang Li Wenchen Yu Guilin Xie Yingchun Zhang Weihong Lu School of Chemistry and Chemical engineering Harbin Institute of TechnologyHarbin 150001China Sichuan Gongda Southwest Food Research Co. Ltd.Bazhong 636063China The Intelligent Equipment Research center for the Exploitation of Characteristic Food&Medicine Resources Chongqing Research Institute of Harbin Institute of TechnologyChongqing 401135China

Inflammatory bowel disease(IBD)is characterized by recurrent attacks and long courses,and the number of patients has expanded rapidly year by ***,current conventional strategies exist serious adverse *** this case,it is an urgent issue to find out an effective and safe *** oligosaccharides possess safe and excellent physiological activities,and have attracted enormous attention due to their great therapeutic potential for *** review emphasizes the attenuating effects of distinct functional oligosaccharides on IBD and their structure,and summarizes the main mechanisms from the aspects of regulating intestinal fl ora structure,repairing intestinal barrier,modulating immune function and mediating related signaling pathways in order to reveal the relationship between functional oligosaccharides,immune regulation,intestinal epithelial cells,gut fl ora and IBD *** possess excellent protective effects on IBD,and can be considered as safe and functional ingredients in the health food and pharmaceutical industry.

关键词： Oligosaccharides Colitis Pathogenesis Signaling pathway Action mechanism

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