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Evolution of pore systems in low-maturity oil shales during thermal upgrading--Quantified by dynamic SEM and machine learning

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Petroleum Science 2024年第3期21卷 1739-1750页

作者： Jun Liu xue bai Derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChina International Quantum Academy Shenzhen518048GuangdongChina Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055GuangdongChina Department of Energy and Mineral Engineering Pennsylvania State University ParkPA 16802USA

In-situ upgrading by heating is feasible for low-maturity shale oil,where the pore space dynamically *** characterize this response for a heated substrate concurrently imaged by *** systematically follow the evolution of pore quantity,size(length,width and cross-sectional area),orientation,shape(aspect ratio,roundness and solidity)and their anisotropy—interpreted by machine *** indicate that heating generates new pores in both organic matter and inorganic ***,the newly formed pores are smaller than the original pores and thus reduce average lengths and widths of the bedding-parallel pore ***,the average pore lengths and widths are increased in the bedding-perpendicular ***,heating increases the cross-sectional area of pores in low-maturity oil shales,where this growth tendency fluctuates at300℃.In addition,the orientation and shape of the newly-formed heating-induced pores follow the habit of the original pores and follow the initial probability distributions of pore orientation and ***,limited anisotropy is detected in pore direction and shape,indicating similar modes of evolution both bedding-parallel and *** propose a straightforward but robust model to describe evolution of pore system in low-maturity oil shales during heating.

关键词： Low-maturity oil shale Pore elongation Organic matter pyrolysis In-situthermal upgrading Scanning electron microscopy(SEM) Machine learning

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Recent progress and prospect of carbon-free single-site catalysts for the hydrogen and oxygen evolution reactions

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Nano Research 2022年第2期15卷 818-837页

作者： Jingqi Guan xue bai Tianmi Tang Institute of Physical Chemistry College of ChemistryJilin University2519 Jiefang RoadChangchun 130021China

The key challenge for scalable production of hydrogen from water lies in the rational design and preparation of high-performance and earth-abundant electrocatalysts to replace precious metal Pt and IrO_(2) for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Although atomic M-N-C materials have been extensively studied in heterogeneous catalysis field,the insufficient antioxidant capacity of carbonous substrates hinders their practical application in *** highly active and stable OER electrocatalysts is the key for electrochemical water *** review presents feasible design strategies for fabricating carbon-free single-site catalysts and their applications in HER/OER and overall water *** constitutive relationships between structure,composition,and catalytic performance for HER and OER are detailly discussed,providing ponderable insights into rationally constructing high-performance HER and OER *** perspectives on the challenges and future research orientations in single-site catalysts for electrochemical water splitting are suggested.

关键词： single-atom catalyst single-site catalyst hydrogen evolution reaction oxygen evolution reaction water splitting

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Saturation phenomenon of Ce and Ti in the modification of Al–Zn–Si filler metal

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International Journal of Minerals,Metallurgy and Materials 2015年第2期22卷 184-189页

作者： Jin-long Yang Song-bai xue Wei Dai Peng xue College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Zhejiang Xinrui Welding Material Co. Ltd.

Cerium and titanium were added to an A1-42Zn-5.5Si brazing alloy, and the subsequent microstructures of the brazing alloy and the 6061 AI alloy brazing seam were investigated. The microstructures of filler metals and brazed joints were characterized by scanning elec- tron microscopy and X-ray energy dispersion spectrometry. A new Ce-Ti phase formed around the silicon phase in the modified filler metal and this saturation phenomenon was analyzed. Interestingly, following brazing of the 6061 alloy, there is no evidence of the Ce--Ti phase in the brazing seam. Because of the mutual solubility of the brazing alloy and base metal, the quantity of the solvent increases, and the solute Ce and Ti atoms assume an undersaturated state.

关键词： filler metals aluminum alloys brazing cerium titanium saturation

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A hypothetical model of trans-acting R-loops-mediated promoter-enhancer interactions by Alu elements

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Journal of Genetics and Genomics 2021年第11期48卷 1007-1019页

作者： xue bai Feifei Li Zhihua Zhang CAS Key Laboratory of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of SciencesChina National Center for BioinformationBeijing 100101China School of Life Science University of Chinese Academy of SciencesBeijing 100101China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100101China

Enhancers modulate gene expression by interacting with *** of enhancer-promoter interactions(EPIs)in the literature involve the activity of many components,including transcription factors and nucleic ***,the role that sequence similarity plays in EPIs remains largely ***,we report that Alu-derived sequences dominate sequence similarity between enhancers and *** rejecting alternative DNA:DNA and DNA:RNA triplex models,we propose that enhancer-associated RNAs(eRNAs)may directly contact their targeted promoters by forming trans-acting R-loops at those Alu *** show how the characteristic distribution of functional genomic data,such as RNA-DNA proximate ligation reads,binding of transcription factors,and RNA-binding proteins,all align with the Alu sequences of *** also show that these aligned Alu sequences may be subject to the constraint of coevolution,further implying the functional significance of these R-loop ***,our results imply that eRNA and Alu elements associate in a manner previously unrecognized in EPIs and the evolution of gene regulation networks in mammals.

关键词： Alu Enhancer-promoter interaction eRNA R-loop

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The d-orbital regulation of isolated manganese sites for enhanced oxygen evolution

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Nano Research 2023年第8期16卷 10796-10802页

作者： xue bai Jingyi Han Xiaodi Niu Jingqi Guan Institute of Physical Chemistry College of ChemistryJilin University2519 Jiefang RoadChangchun 130021China College of Food Science and Engineering Jilin UniversityChangchun 130062China

Developing transition metal-nitrogen-carbon materials(M-N-C)as electrocatalysts for the oxygen evolution reaction(OER)is significant for low-cost energy conversion *** d-orbital adjustment of M center in M-N-C is beneficial to the improvement of OER ***,we synthesize a single-Mn-atom catalyst based on carbon skeleton(Mn_(1)-N_(2)S_(2)C_(x))with isolated Mn-N_(2)S_(2)sites,which exhibits high alkaline OER activity(η10=280 mV),low Tafel slope(44 mV·dec^(−1)),and excellent *** calculations reveal the pivotal function of isolated Mn-N_(2)S_(2)sites in promoting OER,including the adsorption kinetics of intermediates and activation mechanism of active *** doping of S causes the increase in both charge density and work function of active Mn center,and ortho-Mn_(1)-N_(2)S_(2)C_(x)expresses the fastest OER kinetics due to the asymmetric plane.

关键词： dual-heteroatom coordination Mn1-N_(2)S_(2)C_(x) oxygen evolution reaction(OER) single-atom catalyst theoretical calculation

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Insight into the change in carbon structure and thermodynamics during anthracite transformation into graphite

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 162-172页

作者： Tian Qiu Jian-guo Yang xue-jie bai National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The thermodynamic and kinetic mechanisms of Taixi anthracite during its graphitization process were *** understand the variation trends of carbon arrangement order,microcrystal size,and graphitization degree against temperature during the graphitization process,a series of experiments were performed using Raman spectroscopy and X-ray diffraction(XRD).Subsequently,the influencing factors of the dominant reaction at different temperatures were analyzed using thermodynamics and *** results showed that the graphitization process of Taixi anthracite can be divided into three stages from the perspective of reaction thermodynamics and *** played a crucial role in the formation and growth of a graphitic ***,multivariate mechanisms coexisted in the graphitization *** ultrahigh temperatures,the defects of synthetic graphite could not be completely eliminated and perfect graphite crystals could not be *** low temperatures,the reaction is mainly controlled by dynamics,while at high temperatures,thermodynamics dominates the direction of the reaction.

关键词： anthracite graphitization thermodynamics kinetics

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On the Existence and Uniqueness of Solutions to Stochastic Differential Equations Driven by G-Brownian Motion with Integral-Lipschitz Coefficients

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Acta Mathematicae Applicatae Sinica 2014年第3期30卷 589-610页

作者： xue-peng bai Yi-qing LIN Institut de Recherche Mathématique de Rennes Université de Rennes1 School of Mathematics Shandong University Institut de Recherche Mathématique de Rennes Université de Rennes

In this paper, we study the existence and uniqueness of solutions to stochastic differential equations driven by G-Brownian motion （GSDEs） with integral-Lipschitz coefficients.

关键词： G-Brownian motion G-expectation G-stochastic differential equations G-backward stochastic differential equations integral-Lipschitz condition

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Sources of dissolved inorganic carbon in rivers from the Changbaishan area, an active volcanic zone in North Eastern China

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Acta Geochimica 2017年第3期36卷 410-415页

作者： xue bai Benjamin Chetelat Yilong Song Institute of Surface-Earth System Science Tianjin University 92 Weijin Road Tianjin 300072 China School of Environmental Engineering Tianjin University 92 Weijin Road Tianjin 300072 China

Major elements and carbon isotopes of dissolved inorganic carbon(DIC)have been measured in the waters of Changbaishan mountain,a volcanic area in northeastern China,between June and September 2016 to decipher the origin of the CO_2 involved in chemical weathering *** variations of major elements ratios measured in water samples can be explained by a change of the chemical composition of the volcanic rocks between the volcanic cone(trachytes)and the basaltic shield as evidenced by the variations in the composition of these ***,DIC results from the neutralization of CO_2 by silicate *** concentrations vary from 0.3 to 2.5 mmol/L and carbon isotopic compositions of DIC measured in rivers vary from-14.2‰to 3.5‰.At a first order,the DIC transported by rivers is derived from the chemical weathering’s consumption of CO_2 with a magmatic origin,enriched in^(13)C(-5%)and biogenic soil CO_2 with lower isotopic *** highest δ^(13)C values likely result from C isotopes fractionation during CO_2 degassing in rivers.A mass balance based on carbon isotopes suggest that the contribution of magmatic CO_2 varied from less than 20%to more than 70%.Uncertainties in this calculation associated with CO_2 degassing in rivers are difficult to quantify,and the consequence of CO_2 degassing would be an overestimation of the contribution of DIC derived from the neutralization of magmatic CO_2 by silicate rocks.

关键词： Carbon isotopes Dissolved inorganic carbon Rivers Chemical weathering Changbaishan Active volcanic zone

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Perovskite LaFeO_3 supported bi-metal catalyst for syngas methanation

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Journal of Natural Gas Chemistry 2012年第6期21卷 745-752页

作者： Hong Wang Yuzhen Fang Yuan Liu xue bai School of Chemical Engineering Inner Mongolia University of TechnologyHohhot 010062Inner MongoliaChina Tianjin Key Laboratory of Applied Catalysis Science and Engineering Department of Catalysis Science and TechnologySchool of Chemical EngineeringTianjin UniversityTianjin 300072China

LaFeO3 perovskite supported Ni and Ni-Fe catalysts were prepared and applied to methanation reaction of syngas. Two preparation methods were employed. One was one-step citrate complexing method, and the other was a two step method using citrate complexing method to produce LaFeO3 and followed by loading nickel oxide on it with impregnation. The structure evolution of the sample as prepared was investigated by XRD, TPR and TEM techniques. For the former, the chemical composites of the calcined sample are NiO-Fe2O3/LaFe1-xNixO3. After reduction and reaction of CO methanation, its composites convert to Fe-Ni@Ni/LaFeO3-La2O2CO3, in which Fe-Ni@Ni is metal particles in nano-size composed of nickel core and Fe-Ni alloy shell. For the latter, the chemical composites of the calcined sample are NiO/LaFeO3; and after reduction and reaction of CO methanation, its chemical composites change to Ni/LaFeO3. Ni/LaFeO3 catalyst is a little more active, while Fe-Ni@Ni/LaFeO3-La2O2CO3 is much more stable and shows very good resistance to carbon deposition. In this work it is aimed to show that the structure and composites of the catalysts can be tailored using perovskite-type oxide as precursor with different preparing method or preparing condition. Therefore, it is a promising route to prepare supported bi-metal catalysts in nano-size for a lot of metals with desired catalytic performances.

关键词： perovskite bi-metal nickel iron syngas methanation

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Discrete Variable Structural Optimization based on Multidirectional Fuzzy Genetic Algorithm

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Chinese Journal of Mechanical Engineering 2012年第2期25卷 255-261页

作者： LAI Yinan DAI Ye bai xue CHEN Dongyan School of Mechanical and Power Engineering Harbin University of Science and TechnologyHarbin 150080China School of Applied Science Harbin University of Science and TechnologyHarbin 150080China

Round method is the common method for discrete variable optimization in optimal design of complex mechanical structures;however,it has some disadvantages such as poor precision,simple model and lacking of working conditions＇ description,*** solve these problems,a new model is constructed by defining parameterized fuzzy entropy,and the rationality of parameterized fuzzy entropy is *** a new multidirectional searching algorithm is further put forward,which takes information of actual working conditions into consideration and has a powerful local searching *** this new algorithm is combined with the GA by the fuzzy clustering algorithm（FCA）.With the application of FCA,the optimal solution can be effectively filtered so as to retain the diversity and the elite of the optimal solution,and avoid the structural re-analysis phenomenon between the two *** structure design of a high pressure bypass-valve body is used as an example to make a structural optimization by the proposed HGA and finite element method（FEM）,*** comparison result shows that the improved HGA fully considers the characteristic of discrete variable and information of working conditions,and is more suitable to the optimal problems with complex working ***,the research provides a new approach for discrete variable structure optimization problems.

关键词： parameterized fuzzy entropy fuzzy clustering analysis multidirectional searching algorithm genetic algorithm high pressure bypass-valve

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