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Biocompatible and non cytotoxic nucleoside-based AIEgens sensor for lighting-up nucleic acids

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Chinese Chemical Letters 2021年第5期32卷 1687-1690页

作者： Qiuyun xiao xuan Zhao Hai Xiong Institute for Advanced Study Shenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Aggregation-induced emission luminogens(AIEgens) have been used in biomacromolecules ***,TPE-dC and TPE-dU acted as the nucleoside-based AIEgens sensors in the first case,which can be used to detect ctDNA and rRNA in vitro and light up the nucleus in vivo depending on the intermolecular binding *** AIE process enables the quantitative analysis or visualization of nucleic acids in solution or gels state,***,confocal laser scanning microscopy(CLSM) images of L929 cells stained with TPE-dC or TPE-dU clearly shows that nucleoside-based AIEgens bio-probes can pass the cell membranes to reach the cell nucleus,without cytotoxicity at the imaging condition(incubation time> 12 h,and 10 μmol/L of concentration).Since the nucleus is rich in DNA/RNA,fluorescence turn-on mode has a great potential in nucleus imaging and clinical diagnosis.

关键词： AIEgens Nucleoside Biosensor Nucleus localization Cell imaging

Interannual variations in salt flux at 80°E section of the equatorial Indian Ocean

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Science China Earth Sciences 2023年第9期66卷 2142-2161页

作者： Cuncun XIE Ruibin DING Jiliang xuan Daji huang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Guangxi Key Laboratory of Beibu Gulf Marine Resources Environment and Sustainable DevelopmentFourth Institute of OceanographyMinistry of Natural ResourcesBeihai 536015China Institute of Polar and Ocean Technology Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

The interannual variations in salt flux on the 80°E section in the equatorial Indian Ocean were explored based on the ORAS5 data,which was quite consistent with the observational data among the four available reanalysis *** results indicated that the area with significant interannual variations in salt flux coincided with that of significant climatological mean salt flux in general and was mainly located in the upper 150 m ***,three important areas were identified in the north-south direction,i.e.,(1)the Equatorial Indian Ocean Area(EIOA,3°S–3°N),where the mean salt flux was eastward with the largest value on the section and associated with the most significant interannual variations mainly modulated by the Wyrtki Jets and the Equatorial Undercurrent;(2)the South Equatorial Indian Ocean Area(SEIOA,3°S–6°S),where the mean salt flux changed in the vertical direction from strong eastward flux in the upper layer to weak westward flux in the subsurface layer and associated with significant interannual variations in the upper 100 m layer,which was affected by the South Equatorial Countercurrent;and(3)the North Equatorial Indian Ocean Area(NEIOA,3°N–6°N),where the mean salt flux changed in the north-south direction from strong westward flux to the north of 5°N to weak eastward flux in the south and associated with relatively significant interannual variations,which was mainly influenced by the South Sri Lanka Coastal *** leading interannual variation modes were revealed by the empirical orthogonal function *** first mode accounted for 39%of the total variance and had four significant spatial antinodes;two of those in-phase antinodes were located at SEIOA and upper 75 m of EIOA,and the other two opposite in-phase antinodes were located at NEIOA and below 75 m of *** second mode accounted for 17%of the total variance having four antinodes with two dominant out-of-phase antinodes located at the subsurface of EIOA and ***

关键词： Salt flux Interannual variation 80°E section Equatorial Indian Ocean Current

Bohmian trajectory perspective on strong field atomic processes

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Chinese Physics B 2020年第1期29卷 1-8页

作者： xuan-Yang Lai xiao-Jun Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China

The interaction of an atom with an intense laser field provides an important approach to explore the ultrafast electron dynamics and extract the information of the atomic and molecular structures with unprecedented attosecond temporal and angstrom spatial resolution. To well understand the strong field atomic processes, numerous theoretical methods have been developed, including solving the time-dependent Schr ?dinger equation(TDSE), classical and semiclassical trajectory method, quantum S-matrix theory within the strong-field approximation, etc. Recently, an alternative and complementary quantum approach, called Bohmian trajectory theory, has been successfully used in the strong-field atomic physics and an exciting progress has been achieved in the study of strong-field phenomena. In this paper, we provide an overview of the Bohmian trajectory method and its perspective on two strong field atomic processes, i.e., atomic and molecular ionization and high-order harmonic generation, respectively.

关键词： Bohmian trajectory strong-field ionization high-order harmonic generation

Nanotwining induced by tensile fatigue and dynamic impact of laser powder bed fusion additively manufactured CoCrFeNi high-entropy alloy

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Journal of Materials Science & Technology 2024年第16期183卷 241-257页

作者： Guoqing huang Bo Li Yinan Chen Fuzhen xuan School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Additive Manufacturing and Intelligent Equipment Research Institute East China University of Science and TechnologyShanghai 200237China Shanghai Collaborative Innovation Center for High-end Equipment Reliability Shanghai 200237China

The laser powder bed fusion(L-PBF)additively manufactured CoCrFeNi high-entropy alloy(HEA),with face-centered cubic(FCC)crystal structure,demonstrates better comprehensive mechanical properties in the building direction(BD).Loading quasi-static,dynamic fatigue,and dynamic separated Hopkinson press bar(SHPB)impact stress conditions along the BD of the L-PBF processed HEA exhibit intriguing mi-crostructural evolution *** L-PBF generates hierarchical dislocation grids containing nu-merous cell substructures within the HEA FCC grains,impeding dislocation motion during deformation and improving the *** subjected to dynamic fatigue loading,the dislocation grids restrict the mean free path of dislocations and thus trigger the activation of abundant stacking ***,nu-merous nanotwins form near the end of the fatigue *** twinning systems can also be activated under dynamic high-speed impact *** at a low temperature of 77 K,the stacking fault energy of the CoCrFeNi HEA decreases,resulting in increased activation of nanotwins,exhibiting excep-tional toughness and resistance to dynamic *** twin boundaries also impede dislocation movement for the strain *** findings hold valuable implications for the study of additively manufactured HEA parts working in extreme environments.

关键词： High-entropy alloy Nanotwins Fatigue Impact behavior Additive manufacturing

Oxygen-assisted zinc recovery from electric arc furnace dust using magnesium chloride

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2300-2311页

作者： Jingdong huang xiao Yang School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China School of Engineering Westlake UniversityHangzhou 310030China

Electric arc furnace(EAF)dust is an important secondary resource containing metals,such as zinc(Zn)and iron(Fe).Recover-ing Zn from EAF dust can contribute to resource recycling and reduce environmental ***,the high chemical stability of ZnFe_(2)O_(4)in EAF dust poses challenges to Zn *** address this issue,a facile approach that involves oxygen-assisted chlorination using molten MgCl_(2)is *** work focused on elucidating the role of O2 in the reaction between ZnFe_(2)O_(4)and molten MgCl_(2).The results demonstrate that MgCl_(2)effectively broke down the ZnFe_(2)O_(4)structure,and the high O2 atmosphere considerably promoted the sep-aration of Zn from other components in the form of ZnCl_(2).The presence of O2 facilitated the formation of MgFe_(2)O_(4),which stabilized Fe and prevented its ***,the excessive use of MgCl_(2)resulted in increased evaporation loss,and high temperatures pro-moted the rapid separation of *** on these findings,we successfully extracted ZnCl_(2)-enriched volatiles from practical EAF dust through oxygen-assisted *** optimized conditions,this method achieved exceptional Zn chlorination percentage of over 97%within a short period,while Fe chlorination remained below 1%.The resulting volatiles contained 85wt%of ZnCl_(2),which can be further processed to produce metallic *** findings offer guidance for the selective recovery of valuable metals,particularly from solid wastes such as EAF dust.

关键词： electric arc furnace dust zinc oxygen magnesium chloride chlorination

Image Analysis by Two Types of Franklin-Fourier Moments

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IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1036-1051页

作者： Bing He Jiangtao Cui Bin xiao xuan Wang the School of Computer Science and Technology Xidian UniversityXi’an 710071China the School of Physics and Electrical Engineering WeiNan Normal UniversityWeinan 714000China the Key Laboratory of Computational Intelligence Chongqing University of Posts and TelecommunicationsChongqing 400065China the School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710062China

In this paper,we first derive two types of transformed Franklin polynomial:substituted and weighted radial Franklin *** radial orthogonal moments are proposed based on these two types of polynomials,namely substituted Franklin-Fourier moments and weighted Franklin-Fourier moments(SFFMs and WFFMs),which are orthogonal in polar *** radial kernel functions of SFFMs and WFFMs are transformed Franklin functions and Franklin functions are composed of a class of complete orthogonal splines function system of degree ***,it provides the possibility of avoiding calculating high order polynomials,and thus the accurate values of SFFMs and WFFMs can be obtained directly with little computational *** and experimental results show that Franklin functions are not well suited for constructing higher-order moments of SFFMs and WFFMs,but compared with traditional orthogonal moments(e.g.,BFMs,OFMs and ZMs)in polar coordinates,the proposed two types of Franklin-Fourier Moments have better performance respectively in lower-order moments.

关键词： Franklin functions image reconstruction moment invariants object recognition orthogonal moments

Visible light-mediated C—P bond formation reactions

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Science Bulletin 2019年第5期64卷 337-350页

作者： Bao-Gui Cai Jun xuan Wen-Jing xiao Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials College of Chemistry & Chemical Engineering Anhui University Key Laboratory of Pesticide & Chemical Biology Ministry of Education College of Chemistry Central China Normal University

Organophosphorus compounds have attracted continuous attention in materials science, agrochemical and pharmaceutical fields due to their unique bioactivities. Thus, the development of novel and robust manners for the construction new C—P bond has therefore gained great interests in synthetic organic chemistry. Because of their intrinsic sustainability and green chemistry character, visible light-induced photoredox catalysis has been widely applied in the construction of new chemical bonds, including the formation of C—P bond. In this review, we summarized recent achievements in C—P bond formation reactions initiated by visible light-induced photoredox catalysis, which mainly focusing on the discussion of reaction design and the mechanism.

关键词： C-P bond formation Organophosphorus compounds Photoredox catalysis Visible light

超碱NLi_(4)团簇修饰DHQ石墨烯的储氢性能研究

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原子与分子物理学报 2025年第5期42卷 95-101页

作者：戴小乐王允辉黄欣南京邮电大学电子与光学工程学院柔性电子(未来技术)学院南京210023 南京邮电大学理学院南京210023

基于第一性原理计算,系统研究了超碱NLi_(4)团簇修饰在DHQ石墨烯表面上的几何结构及吸附能等性质,并深入探索了其储氢性能.研究结果表明:超碱NLi_(4)团簇可以稳定均匀地吸附在DHQ石墨烯表面,Li原子与N原子的强结合能有效避免了Li原子发... 详细信息

基于第一性原理计算,系统研究了超碱NLi_(4)团簇修饰在DHQ石墨烯表面上的几何结构及吸附能等性质,并深入探索了其储氢性能.研究结果表明:超碱NLi_(4)团簇可以稳定均匀地吸附在DHQ石墨烯表面,Li原子与N原子的强结合能有效避免了Li原子发生团聚.每个NLi_(4)团簇周围最多可吸附11个氢气分子,平均吸附能为0.20 eV,最大储氢容量为12.05 wt%,达到美国能源部制定的2025年储氢目标5.5 wt%.最后,基于相对能量计算,发现当压强大于84 bar时,该储氢体系可以在室温下稳定存在.以上结果表明经超碱NLi_(4)团簇修饰的DHQ石墨烯是一种有潜力的储氢材料.

关键词：多孔材料储氢超碱NLi_(4)团簇 DHQ石墨烯第一性原理计算

Effect of rigid gas permeable contact lens on keratoconus progression: a review

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International Journal of Ophthalmology(English edition) 2020年第7期13卷 1124-1131页

作者： xiao-Han Zhang xuan Li Clinical College of Ophthalmology Tianjin Medical UniversityTianjin Eye HospitalTianjin Eye InstituteTianjin Key Lab of Ophthalmology and Visual ScienceTianjinChina

The prevalence of keratoconus is 1/2000 in the general population and is high in *** is a progressive disease,which has a great impact on patients’quality of life and mental *** can be managed by surgical and non-surgical means,rigid gas permeable(RGP)contact lens as its main non-surgical method is widely used in *** efficacy of wearing RGP contact lens has been confirmed to some extent,but some studies have found that wearing RGP contact lens has adverse effects,which may promote disease *** this paper,the advantages and disadvantages of RGP contact lens in controlling keratoconus were reviewed to provide more suggestions and references for the clinical application of RGP contact lens.

关键词： rigid gas permeable keratoconus contact lens