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Cystine-assisted accumulation of gold nanoparticles on ZnO to construct a sensitive surface-enhanced Raman spectroscopy substrate

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Frontiers of Chemical Science and Engineering 2023年第1期17卷 15-23页

作者： qi Qu Chuan Zeng jing Huang Mengfan Wang Wei qi Zhimin He School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300072China School of Life Sciences Tianjin UniversityTianjin 300072China Co-Innovation Centre of Chemistry and Chemical Engineering of Tianjin Tianjin 300072China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin 300350China Technical Centre of Gongbei Customs District of China Zhuhai 519000China

Recently,various semiconductor/metal composites have been developed to fabricate surfaceenhanced Raman spectroscopy ***,low metal loading on semiconductors is still a *** this study,cystine was introduced to increase the accumulation of gold nanoparticles on zinc oxide,owing to the biomineralization_property of_*** analysis revealed that the obtained ZnO/Au/cystine composite not only had a higher metal loading but also formed a porous structure,which is beneficial for Raman *** with ZnO/Au,the ZnO/Au/cystine substrate displayed a 40-fold enhancement in the Raman signal and a lower limit of detection(10^(-11) mol·L^(-1))in the detection of rhodamine ***,the substrate has favorable homogeneity and ***,ZnO/Au/cystine displayed excellent performance toward crystal violet and methylene blue in a test based on river water *** study provided a promising method to fabricate sensitive semiconductor/noblemetal-based surface-enhanced Ramans spectroscopy substrates for Raman detection.

关键词： biomineralization cystine semiconductor/metal composite SERS detection Raman detection

Effect of nano-sized precipitates on the crystallography of ferrite in high-strength strip steel

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International Journal of Minerals,Metallurgy and Materials 2014年第5期21卷 448-454页

作者： jing-jing Yang Run Wu Wen liang Meng-xia Tang Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of Education Wuhan University of Science and Technology State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Institute of Research and Design Wuhan Iron and Steel Corporation

For strip steel with the thickness of 1.6 ram, the yield and tensile strengths as high as 760 and 850 MPa, respectively, were achieved using the compact strip production technology. Precipitates in the steel were characterized by scanning and transmission electron microscopy to elucidate the strengthening mechanism. In addition, intragranular misorientation, Kernel average misorientafion, and stored energy were measured using electron backscatter diffraction for crystallographic analysis of ferrite grains containing precipitates and their neighbors without precipitates. It is found that precipitates in specimens primarily consist of TiC and Ti4CzS2. Ferrite grains containing pre- cipitates exhibit the high Taylor factor as well as the crystallographic orientations with {012}, {011}, {112}, or {221} plane parallel to the rolling plane. Compared with the intragranular orientation of adjoining grains, the intragranular misorientation of grains containing precipi- tates fluctuates more frequently and more mildly as a function of distance. Moreover, the precipitates can induce ferrite grains to store a rela- tively large amount of energy. These results suggest that a correlation exists between precipitation in ferrite grains and grain crystallographic properties.

关键词： high strength steel crystallography precipitates hot rolling

Effect of magnesium addition on inclusions in H13 die steel

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International Journal of Minerals,Metallurgy and Materials 2014年第11期21卷 1062-1067页

作者： Zheng Wu jing Li Cheng-bin Shi liang-liang Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The effect of magnesium addition on the number, morphology, composition, size, and density of inclusions in H13 die steel was studied. The results show that the total oxygen content in the steel can be significantly decreased to 0.0008wt%. Al2O3 and Mn S inclusions are changed into nearly spherical Mg O·Al2O3 spinel and spherical Mg O·Mg S inclusions, respectively. The number of inclusions larger than 1 μm decreases and the number of inclusions smaller than 1 μm increases with increasing magnesium content. V（N,C） precipitates around Mg O·Al2O3 and Mg O·Mg S inclusions during solidification of liquid steel. The densities of Mg O·Al2O3 spinel inclusions are lower than that of alumina inclusions. With increasing magnesium content in the Mg-containing inclusions, the density of inclusions decreases, leading to the improvement of inclusion removal efficiency.

关键词： die steel inclusions magnesium deoxidation thermodynamics

First-principles calculations of Ni–(Co)–Mn–Cu–Ti all-d-metal Heusler alloy on martensitic transformation,mechanical and magnetic properties

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International Journal of Minerals,Metallurgy and Materials 2023年第5期30卷 930-938页

作者： Huaxin qi jing Bai Miao Jin Jiaxin Xu Xin Liu Ziqi Guan Jianglong Gu Daoyong Cong Xiang Zhao liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

The martensitic transformation,mechanical,and magnetic properties of the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) (x=0.125,0.25,0.375,0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5)[(x=0.125,y=0.125,0.25,0.375,0.5) and (x=0.125,0.25,0.375,y=0.625)]alloys were systematically studied by the first-principles *** the formation energy,the martensite is smaller than the austenite,the Ni–(Co)–Mn–Cu–Ti alloys studied in this work can undergo martensitic *** austenite and non-modulated (NM) martensite always present antiferromagnetic state in the Ni_(2)Mn_(1.5-x)Cu_(x)Ti_(0.5) and Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) (y<0.625) *** y=0.625 in the Ni_(2-y)Co_(y)Mn_(1.5-x)Cu_(x)Ti_(0.5) series,the austenite presents ferromagnetic state while the NM martensite shows antiferromagnetic *** doping can decrease the thermal hysteresis and anisotropy of the Ni–(Co)–Mn–Ti *** Mn and decreasing Ti content can improve the shear resistance and normal stress resistance,but reduce the toughness in the Ni–Mn–Cu–Ti *** the ductility of the Co–Cu co-doping alloy is inferior to that of the Ni–Mn–Cu–Ti and Ni–Co–Mn–Ti *** electronic density of states was studied to reveal the essence of the mechanical and magnetic properties.

关键词： Ni–Mn–Ti-based all-d-metal Heusler alloys first-principles calculations mechanical properties martensitic transformation magnetic properties

Selective hydrogenation of 4-nitrostyrene to 4-nitroethylbenzene catalyzed by Pd@Ru core–shell nanocubes

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Rare Metals 2022年第4期41卷 1189-1194页

作者： jing-jing Fang qi-Ming Liu Xiong-Wu Kang Shao-Wei Chen New Energy Technology Institute School of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Department of Chemistry and Biochemistry University of CaliforniaCA 95064USA

It is a challenge to selectively hydrogenate 4-nitrostyrene to 4-nitroethylbenzene,due to the similar energy barrier of hydrogenation of the nitro and vinyl ***,we demonstrate that such selective hydrogenation can be achieved by Pd@Ru core–shell nanocubes that are pre-pared by epitaxial growth of a face-centered cubic Ru shell on Pd *** core–shell structure of Pd@Ru nanocubes is conflrmed by transmission electron microscopy,X-ray diffraction spectroscopy,and elemental mapping *** is found that the electronic structure and hence the catalytic activity of the Pd@Ru nanocubes can be readily modulated by the Ru shell *** is manifested in electrochemical CO stripping measurements where a decrease of CO adsorption energy is observed on Pd@Ru nanocubes with the increase of the Ru shell *** from this study suggest that deliberate structural engineering can be exploited to prepare bimetallic core–shell nanostructures for highly active and selective hydrogenation of organic molecules with multi-functional moieties.

关键词： hydrogenation styrene benzene

Potential impacts of climate change on dengue fever distribution using RCP scenarios in China

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Advances in Climate Change Research 2019年第1期10卷 1-8页

作者： FAN jing-Chun LIU qi-Yong School of Public Health Gansu University of Chinese MedicineLanzhou730000China State Key Laboratory of Infectious Disease Prevention and Control Collaborative Innovation Center for Diagnosis and Treatinent of Infectious DiseasesNational Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and Prevention(China CDC)Beijing102206China Shandong University Climate Change and Health Center School of Public HealthShandong UniversitJinan250012China

This study projected dengue distribution risk map using representative concentration pathways(RCP2.6,RCP4.5,RCP6.0,RCP8.5)in China in 2020s,2030s,2050s and *** on the biological characteristics of Aedes albopictus and the dengue epidemic process,dengue transmission biological model was developed to project the risk epidemic *** temperature data in 1981-2016 at 740 stations and grid data of 0.5°×0.5°(15°-55.5°N,70°-140.5E)under selected RCPs in 2020s,2030s,2050s and 2100s were *** to 142 counties and 168 million people living in the projected high risk area of dengue in the climate condition of 1981-2016,dengue high risk areas in China would expand under same RCP scenarios in the 21st century with time past except RCP2.6 with a turning down point in *** under RCP8.5 which global mean temperature would increase by 4.9 C till 2100s,the high risk area and population for dengue transmission would expand additional 34 counties(20 million)in 2020s,114 counties(60 million)in 2030s,208 counties(160 million)in 2050 and 456 counties(490 million)in 2100s respectively than those of *** RCP8.5 in 2100s,the population and expanded high risk areas would increase 4.2-fold and 2.9-fold than the 1981-2016 *** newly added high risk areas should prepare for controlling and preventing dengue in different period according to projected dengue risk map.

关键词： Dengue fever Climate change Aedes albopictus Representative concentration pathways(RCPs) Risk distribution

Orbit control strategy for Lagrange point orbits based on an analytical method

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Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 830-839页

作者： Lü jing LU qiShao WANG qi School of Aeronautics Science and Engineering Beihang University

The periodic or quasi-periodic orbits around collinear Lagrange points present many properties that are advantageous for space missions. These Lagrange point orbits are exponentially unstable. On the basis of an analytical method, an orbit control strategy that is designed to eliminate the dominant unstable components of Lagrange point orbits is developed. The proposed strategy enables the derivation of the analytical expression of nonlinear control force. The control parameter of this strategy can be arbitrarily selected provided that the parameter is considerably lower than the negative eigenvalue of motion equations, and that the energy required keeps the same order of magnitude. The periodic or quasi-periodic orbit of controlled equations remains near the periodic or quasi-periodic orbit of uncontrolled equations.

关键词： analytical method control strategy Lagrange point periodic or quasi-periodic orbit

CCAAT/enhancer binding proteins play a role in oriLyt-dependent genome replication during MHV-68 de novo infection

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Protein & Cell 2011年第6期2卷 463-469页

作者： jing qi Danyang Gong Hongyu Deng CAS Key Laboratory of Infection and Immunity Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate School of the Chinese Academy of Sciences Beijing 100080China

Murine gammaherpesvirus 68(MHV-68),a member of the gammaherpesvirus family,replicates robustly in permissive cell lines and is able to infect laboratory ***-68 has emerged as a model for studying the basic aspects of viral replication and host–virus interactions of its human *** genome replication is mediated through a cis-element in the viral genome called the origin of lytic replication(oriLyt).A family of transcription factors,CCAAT/enhancer binding proteins(C/EBPs),assists in oriLyt-mediated DNA replication during gammaherpesvirus *** this study,we examined the role of C/EBPs in gammaherpesvirus DNA replication during de novo infection,using MHV-68 as a *** found that C/EBP α and β bind to the CCAAT boxes in the MHV-68 oriLyt core region both in vitro and in vivo,as demonstrated by electrophoretic mobility shift assay and chromatin immunoprecipitation assay.A dominant negative form of C/EBPs significantly impaired the lytic replication efficiency of MHV-68 on both the plasmid and genome levels in a replication assay,indicating that functional C/EBPs are required for maximal MHV-68 genome DNA ***,our data demonstrate that C/EBPs interact with the oriLyt core region and play an important role in MHV-68 lytic DNA replication during de novo infection.

关键词： C/EBPs murine gammaherpesvirus 68 oriLyt lytic replication

Simulation of Interference Nanolithography of Second-Exciting Surface-Plasmon Polartions for Metal Nanograting Fabrication

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Chinese Physics Letters 2011年第1期28卷 205-207页

作者： liang Hui-Min WANG jing-Quan College of Science Hebei University of Engineering Handan 056038 Department of Physics Sichuan University Chengdu 610064

Second-exciting surface-polasmon-polariton （SPP） interference lithography （SE-SPPIL） designed by an improving attenuated total reflection （ATR） mode is suggested for fabricating metal nanograting. A metal film coated under a prism excites SPP first, and then the SPP energy transmits into another metal film and launches SPP again. An interlayer between two metal films is a thin resist coated on the second metal film. An interference nanopattern is formed in the resist when two SPP waves are launched symmetrically. After development, chemical or physical etching, the nanopattern is transferred into the metal film. A random thickness metal grating can be achieved as the thickness of the second metal film does not influence the interference pattern intensity. This scheme is promising for fabricating metal nanograting at low cost.

关键词： Condensed matter: electrical, magnetic and optical Optics, quantum optics and lasers Nanoscale science and low-D systems