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Fractionation characteristics of magnesium isotope in the ancient weathering crust

Petroleum Science 2023年第3期20卷 1446-1457页

作者： Jia-Qi Yang Jun-Tao Zhang Zhi-Liang he Ni-Na Luo xiao-Hui Jjin Tao Zhang Ning gu Kang-Jun Huang jian Gao School of Energy Resources China University of GeosciencesBeijing100083China SINOPEC Exploration and Production Research Institute Beijing100083China China Petrochemical Corporation Ltd. Beijing100728China Key Laboratory of Deep Geology and Resources SINOPECBejing102206China Chongqing Gas Field of Petro China Southwest Oil and Gas Field Company Chongqing400021China Shaanxi Key Laboretory of Early Life and Environments Department of GeologyNorthwest UniversityXi'anShaanxi710069China

Weathering has always been a concerned around the world,as the first and most important step in the global cycle of elements,which leads to the fractionation of isotopes on the scale of geological *** Middle Ordovician Majiagou Formation in Daniudi area of the Ordos Basin had experienced weathering for>130 *** thin section observation,major and trace element analysis,carbon,oxygen,and magnesium isotopes composition analysis,the dolomitization modes and weathering of ancient dolo-mite in Daniudi area were analyzed in *** results showed that the Sabkha and brine-reflux dolomitization modes had developed,and the Mg isotopes in different layers of the karst crust were fractionated by various *** vertical vadose zone was affected by weathering,the Mg isotope of dolomite(δ^(26)Mgdol)showed a downward decreasing trend;the horizontal underflow zone was controlled by diagenesis and formation fluid,δ^(26)Mgdol showed a vertical invariance and negative;the main reason for Mg isotope fractionation in the deep slow-flow zone was the brine-reflux dolomitization mode during early burial period,which showed a vertical downward ***,the Mg isotope characteristic data of the ancient weathering crust were provided and the process of Mg isotope frac-tionationinthekarstcrust was explained.

关键词： Magnesium isotope Dolomitization mode Weathering Ancient weathering crust Ordos Basin

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Studies on the Basic Conformation of Lysozyme by Electrospray Ionization-Mass Spectrometry(ESI-MS)

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Chemical Research in Chinese Universities 2001年第4期17卷 368-373页

作者： gu Sheng SheN Jin-can ZHUANG Zhi-xia WANG xiao-ru Key Laboratory of Analytical Science of Ministry of Education Department of ChemistryXiamen UniversityXiamen 361005P.R.China

In the present work, 2-mercaptoethanol and dithiothreitol were used to hydrogenise the internal disulfide bond in lysozyme. The experimental results indicate that the charge distribution of the proteins are different in the reaction process. From the calculated molecular weight, the reduction process of the disulfide bond in the molecules can be described, and the number of the disulfide bonds in the molecule can also be determined.

关键词： Protein Disulfide Electrospray ionization Mass spectrometry

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Phase Equilibria of Hydrogen Bonding Fluid in a Slit Pore with Broken Symmetry

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Chinese Journal of Chemical Physics 2015年第3期28卷 288-294,I0001页

作者： xiao-yu Liu Jiang-tao Li Fang gu Hai-jun Wang College of Chemistry and Environmental Science Hebei University Baoding 071002 China Chemical Biology Key Laboratory of hebei Province Hebei University Baoding 071002 China Key Laboratory of Medical Chemistry and Molecular Diagnosis Ministry of Education BaodinE 071002 China

Phase equilibria of hydrogen bonding （HB） fluid confined in a slit pore with broken symmetry were investigated by the density functional theory incorporated with modified fundamental measure theory, where the symmetry breaking originated from the distinct interactions between fluid molecules and two walls of the slit pore. In terms of adsorption-desorption isotherms and the corresponding grand potentials, phase diagrams of HB fluid under various conditions are presented. Furthermore, through phase coexistences of laying transition and capillary condensation, the effects of HB interaction, pore width, fluid-pore interaction and the broken symmetry on the phase equilibrium properties are addressed. It is shown that these factors can give rise to apparent influences on the phase equilibria of confined HB fluid because of the competition between intermolecular interaction and fluid-pore interaction. Interestingly, a significant influence of broken symmetry of the slit pore is found, and thus the symmetry breaking can provide a new way to regulate the phase behavior of various confined fluids.

关键词： Hydrogen bonding fluid Broken symmetry Phase equilibria Density functional theory

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Transcriptional regulatory network during axonal regeneration of dorsal root ganglion neurons:laser-capture microdissection and deep sequencing

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Neural Regeneration Research 2023年第9期18卷 2056-2066页

作者： Li-Li Zhao Tao Zhang Wei-xiao Huang Ting-Ting guo xiao-Song gu Model Animal Research Center and MOE Key Laboratory of Animal Models of Disease Nanjing UniversityNanjingJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina School of Medicine and Life Sciences Nanjing University of Chinese MedicineNanjingJiangsu ProvinceChina

The key regulators and regeneration-associated genes involved in axonal regeneration of neurons after injury have not been *** high-throughput sequencing,various factors influence the final sequencing results,including the number and size of cells,the depth of sequencing,and the method of cell *** is still a lack of research on the detailed molecular expression profile during the regeneration of dorsal root ganglion neuron *** this study,we performed lase r-capture microdissection coupled with RNA sequencing on dorsal root ganglion neurons at 0,3,6,and 12 hours and 1,3,and 7 days after sciatic nerve crush in *** identified three stages after dorsal root ganglion injury:early(3-12 hours),pre-regeneration(1 day),and regeneration(3-7 days).Gene expression patterns and related function enrichment res ults showed that one module of genes was highly related to axonal *** verified the up-regulation of activating transcription factor 3(Atf3),Kruppel like factor 6(Klf6),AT-rich inte raction domain 5A(Arid5α),CAMP responsive element modulator(Crem),and FOS like 1,AP-1 transcription factor Subunit(Fosl1) in dorsal root ganglion neurons after *** these transcription factors(Crem,Arid5o,Fosl1 and Klf6) reduced axonal regrowth in *** the hub transcription factor,Atf3 showed higher expression and activity at the preregeneration and regeneration stages.G protein-coupled estrogen receptor 1(Gper1),inte rleukin 12a(Il12α),estrogen receptor 1(ESR1),and interleukin 6(IL6) may be upstream factors that trigger the activation of Atf3 during the repair of axon injury in the early *** study presents the detailed molecular expression profile during axonal regeneration of dorsal root ganglion neurons after peripheral nerve *** findings may provide reference for the clinical screening of molecular targets for the treatment of peripheral nerve injury.

关键词： Arid5a Atf3 Crem dorsal root ganglion Fosl1 Klf6 laser-capture microdissection neuron smart-seq2 gene expression profile transcription factor

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Motivations, Mechanisms, and Paths of Business Model Innovation Driven by the Digital Economy

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Frontiers of Business Research in China 2024年第2期18卷 83-94页

作者： gu Limin ZHANG xiao Institute of Regional Modernization Jiangsu Provincial Academy of Social SciencesNanjing 210004China Business School Nanjing UniversityNanjing 210093China

The digital economy,underpinned by fundamental digital technologies such as artificial intelligence,blockchain,cloud computing,and big data,facilitates business model innovation,thereby enabling firms to achieve distinctive competitive *** the digital economy creates more development opportunities for businesses,it also subjects them to higher levels of competitive ***,business model innovation is both a proactive choice to perceive and exploit external opportunities and a reactive adaptation to identify and mitigate external *** digital economy drives business model innovation through digital information,internet platforms,digital technologies,and new business models and *** such,firms should utilize data resources innovatively to update their value logic,build digital ecosystems based on internet platforms,enhance digital technology integration to enable agile responses,and gain insights into emerging economic formats to promote cross-industry integration and innovation.

关键词： digital economy business model innovation digital information internet platform digitaltechnology

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The Choice of Mesh Size and Integration Points Number for the Electrostatically Controlled Membrane Antenna Structural-Electromagnetic Coupling Model

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Chinese Journal of Electronics 2024年第2期33卷 443-448页

作者： Yongzhen gu Qinggang ZHANG xiao YU guixu LI Qingdao University of Science and Technology

It is of great significance for the improvement of the computational efficiency of the electrostatically controlled membrane antenna(ECMA) structural-electromagnetic coupling model through the choice of appropriate mesh size and integration points number. In this paper, the physical optics formulation is used to analyze the radiation pattern of the ECMA surface, and the finite element method is applied to the electrostatic-structural coupling analysis. An expression for the relation between the mesh size, the focal length of the parabolic antenna, and the wavelength is developed based on the discretization error analysis of the triangular mesh approximating the parabolic surface. Moreover, the integration points number in each triangular mesh is determined by the numerical evaluation of the physical optics integral. Numerical results show that the proposed method improves the computing efficiency by about 87% compared with the referenced method.

关键词： Couplings Surface waves Error analysis Computational modeling Physical optics Numerical models Finite element analysis

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A Novel Stereoselective Synthesis of 8-O-4' Neolignans

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Chinese Chemical Letters 2001年第2期12卷 109-110页

作者： xiao Chuan CheN Wen Xin gu xiao Bi JING Xin Fu PAN Department of Chemistry National Laboratory of Applied Organic ChemistryLanzhou UniversityLanzhou 730000

1-(4-hydroxy-3-methoxyphenyl)-2-(4-formyl-2-methoxyphenoxy)-propane-1,3-diol. A 8-O-4' neolignan, has been stereoselectively synthesized in eight steps from ferulic acid, and the directly cis opening of epoxide in epo... 详细信息

关键词： 8-O-4’ Neolignans ferulic acid addition Mitsunobu reaction stereoselective synthesis

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Electromagnetic properties of BaZn_2Fe_(16)O_(27)/antimony-doped tin oxide composite absorbing materials by co-precipitation method

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Rare Metals 2014年第6期33卷 697-702页

作者： Jing Zhang Li-Xi Wang xiao-gu Huang Qi-Tu Zhang College of Materials Science and Engineering Nanjing University of Technology

W-type barium ferrite（Ba Zn2Fe16O27）/antimony-doped tin oxide（ATO） composite absorbing materials were synthesized by co-precipitation method, using Ba Zn2Fe16O27 prepared by traditional solid method and SnCl4·5H2O, SbCl3 as main raw materials. The structure and morphology of the composites were characterized using X-ray diffraction（XRD）, scanning electron microscopy（SEM）. The result shows that Ba Zn2Fe16O27/ATO composites were obtained by co-precipitation method, and ATO nano-particles were coated on the surface of Ba Zn2Fe16O27 ferrite. The complex permittivity and complex permeability of Ba Zn2Fe16O27/ATO composite absorbing materials at the frequency range from 2 to 18 GHz were analyzed by vector network analyzer. It is indicated that ATO has strong dielectric property and ferrite shows superior magnetic performance. The result shows that the complex permittivity and dielectric loss of the Ba Zn2Fe16O27/ATO composite absorbing materials are higher than the pure ferrite, and the complex permeability and magnetic loss are higher than the pure ferrite and the pure ATO. When the mole ratio of Ba Zn2Fe16O27/ATO is 1：2, the minimum reflection loss is about-31.14 d B at 12.4 GHz, moreover, the absorption bandwidth reaches 9.6 GHz when RL is-10 d B in the measured frequency range of Ku-band.

关键词： Ferrite ATO Composite Electromagnetic properties

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Modulation of Excitonic Confinement of TiO_(2)in Molten Salts for Overall CO_(2)Photoreduction

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Chinese Journal of Chemistry 2023年第10期41卷 1185-1190页

作者： Jing Wang Ren Sheng Dong gu Yuhao Peng Juanxiu xiao Yijun Shen Wei xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhanHubei 430072China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikouHainan

Excitonic confinement greatly determines the charge carrier transport of photocatalysts.A molten salt modulation of excitonic con-finement is herein demonstrated as formation of ultrafine carbon-doped anatase TiO_(2)with grafted graphitic carbon nitride,which is rationalized as an excellent catalyst for overall CO_(2)*** with bulk TiO_(2),the carbon-doped TiO_(2)(M-TiO_(2))pos-sesses a weaker excitonic confinement to decrease exciton binding energy from 99 to 58 meV,consequently enhancing free-charge-carrier generation and *** Z-scheme electron transfer from M-TiO_(2)to C_(3)N_(4) is built,enhancing the CO_(2)conversion via the synchronous optimization of redox ability,CO_(2)activation,and^(*)COOH *** work highlights the unique chemistry of excitonic dissociation on facilitating separation of electron and hole,and also extends the scope of molten salt-mediated modulation of photocatalysis materials.

关键词： Molten salt CO_(2)reduction Photocatalysis Excitonic confinement Charge transfer

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First Enantioselective Synthesis of (2R,3R)-and(2S,3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1,4-benzodioxan-6-carbaldehyde

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Chinese Chemical Letters 2001年第3期12卷 189-192页

作者： Wen Xin gu xiao Bi JING xiao Chuan CheN Xin Fu PAN Department of Chemistry National Laboratory of Applied Organic ChemistryLanzhou UniversityLanzhou 730000

A novel enantioselective synthetic approach to 1,4-benzodioxane lignans was reported in which (2R, 3R)- and (2S, 3S)-2-(4-hydroxyphenyl)-3-hydroxymethyl-1, 4-benzodioxan-6-carbaldehyde were first synthesized.

关键词： Enantioselectivity synthesis 1 4-benzodioxane lignans.

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