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The Impact of Aqueous Medium on Gas Yields and Kinetic Behaviors of Hydrogen Isotope Fractionation during Organic Matter Thermal Degradation

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Acta Geologica Sinica(English Edition) 2011年第6期85卷 1466-1477页

作者： LU Shuangfang WANG min xue Haitao LI Jijun CHEN Fangwen xu Qingxia Northeast Petroleum University Heilongjiang Province 163318 China

In order to recognize the impact of aqueous medium on gas yields and the kinetic behaviors of hydrogen isotope fractionation during organic matter thermal degradation, the gold tube apparatus was used to conduct thermal simulation experiments by mixing the nC18 with the water of different properties and proportions. The yields of natural gas components, the relation among hydrogen isotope composition of each component and the experimental temperatures vs. heating rates have been obtained, and the results indicate that under the higher temperature conditions, the hydrous experiment has obvious impact on gas yields, such as when more water is added, higher amounts of hydrocarbon gas and H2 are yielded, and the existence of water obviously prolongs the temperature interval with the existence of heavy hydrocarbon gas. It also shows that the hydrogen isotope of hydrocarbon gas generated by the hydrous experiment is obviously lighter than that generated by the anhydrous experiment, and with the increasing amount of added water, the δD value of hydrocarbon gas gradually decreases. Compared with gas yields, the variation of δD value is more sensitive to aqueous medium in the thermal simulation experiment. However, compared with the amount of the added water, the aqueous medium property has smaller impact on the gas yields, which still shows the inherit effect on hydrogen isotope composition of aqueous medium. Through the model simulation and the isotope fractionation behavior analysis, it is validated that the hydrogen isotope fractionation process can be well described by the chemical kinetic model. The difference of reaction fraction of normal methane and D-containing methane is large, corresponding to the same activation energy. The content of normal methane is obviously higher in the part with lower activation energy, while the content of D-containing methane is higher in the part with higher activation energy. Therefore, it will result in larger hydrogen isotope fracti

关键词： hydrogen isotope fractionation chemical kinetics nC18 gas generation hydrous experiment

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A 3-D Differential Method for Solving Rolling Force of PC Hot Strip Mill

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Journal of Iron and Steel Research International 2010年第9期17卷 36-39页

作者： WANG xue-song PENG Yan xu Li-pu LIU Hong-min State Key Laboratory of Metastable Materials Science and Technology Engineering Research Center of Rolling Equipment and Complete Technology of Ministry of Education Yanshan University Qinhuangdao 066004 Hebei China

The character of the deformation zone on pair cross rolls is different from that of the regular 4-high mill. Considering comprehensive influences of normal stress and shear stress in rolling direction, width direction and thickness direction, the rolling force calculation model of the PC （pair crossed） hot strip mill is built. Taking the entry stress and the exit stress of strip as the boundary conditions, the longitudinal and transverse distribution of rolling force is worked out by the differential method. Then the total rolling force is calculated, and calculated results are verified by experimental data.

关键词： PC rolling mill rolling force differential method model building

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Microstructure and Mechanical Properties of NANOBAIN Steel

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Journal of Iron and Steel Research International 2016年第3期23卷 253-260页

作者： Yao HUANG xue-li ZHANG Wei-ning LIU xu-min WANG Jun-ke HAN China Electric Power Research Institute Beijing 100192China Beijing Electric Power Design Institute Beijing 100055China AC Construction Branch State Grid Corporation of ChinaBeijing 100031China

The microstructure and mechanical properties of NANOBAIN steel treated at different isothermal temperatures were investigated by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,uniaxial tensile tests and X-ray diffraction（XRD）.It was found that bainitic ferrite（BF）plate was made of basic shear transformation units arranged in the same direction of *** existence of defects,such as nanoscale twinning and dislocation,suggested that the growth of transformation units was controlled by the surrounding defect plane with dislocation,which was consistent with the moving direction of BF/austenite interface parallel to the twinning *** behavior of work hardening indicated that mechanical stability of microstructures obtained at 250 ℃ and 300 ℃ was much more stable than that obtained at 210℃.The evolution of carbon partitioning in retained austenite and bainitic ferrite also indicated that austenite was enriched in carbon at the initial stage step by step;after the formation of BF,the austenite did not seem to be greatly enriched in carbon and the carbon content showed a little decrease instead;subsequently,aphenomenon of little decarburization of supersaturated bainitic ferrite has also been found.

关键词： NANOBAIN steel shear transformation unit work hardening behavior carbon partitioning

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论政治勇气与政治话语表达——学习《中共中央关于进一步全面深化改革、推进中国式现代化的决定》

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山西师大学报(社会科学版) 2025年第1期52卷 1-7页

作者：荆学民王乐轩中国传媒大学政治传播研究所中国传媒大学政府与公共事务学院

党的二十届三中全会通过的《中共中央关于进一步全面深化改革、推进中国式现代化的决定》,展现了中国共产党“伟大历史主动、巨大政治勇气、强烈责任担当”的精气神，表达了中国共产党“进一步全面深化改革、推进中国式现代化”的政治... 详细信息

党的二十届三中全会通过的《中共中央关于进一步全面深化改革、推进中国式现代化的决定》,展现了中国共产党“伟大历史主动、巨大政治勇气、强烈责任担当”的精气神，表达了中国共产党“进一步全面深化改革、推进中国式现代化”的政治决心。其中，中国共产党的“政治勇气”成为一个亮点。政治勇气作为中国特色社会主义政治话语的集中表达，是与政治改革相匹配的、展现政治决心的、根植于政治实践的政治话语。在不同的历史阶段，我国的政治话语具有不同的侧重点，经历了从革命话语到改革话语的转型。随着党的政治勇气的提升，党的政治话语表达在政治目标上逐步具体、在政治信念上日益坚定、在政治底气上愈发充足。进入新时代，伴随中国共产党的政治勇气的提升，党的二十大提出“中国式现代化”,其话语内涵具有中国特色与世界意义的双重属性。“中国式现代化”作为政治话语表达的创新典范，不仅体现了中国对自身发展道路的政治自信，也彰显了中国愿与世界各国共享现代化建设经验的开放态度。在新的国际政治形势下，国际话语竞争日益激烈，为此可以采用话语框定、话语争论、话语叙事等话语博弈策略，进一步提升中国的国际政治话语权。

关键词：《中共中央关于进一步全面深化改革、推进中国式现代化的决定》政治勇气政治话语

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Mechanism Interpretation of the Biological Brain Cooling and Its Inspiration on Bionic Engineering

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Journal of Bionic Engineering 2011年第3期8卷 207-222页

作者： xu xue Jing Liu Key Lab of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Department of Biomedical Engineering School of Medicine Tsinghua University Beijing 100084 P. R. China

The brain is one of the most important organs in a biological body which can only work in a relatively stable temperature range. However, many environmental factors in biosphere would cause cerebral temperature fluctuations. To sustain and regulate the brain temperature, many mechanisms of biological brain cooling have been evolved, including Selective Brain Cooling （SBC）, cooling through surface water evaporation, respiration, behavior response and using special anatomical ap- pendages. This article is dedicated to present a summarization and systematic interpretation on brain cooling strategies devel- oped in animals by classifying and comparatively analyzing each typical biological brain cooling mechanism from the per- spective of bio-heat transfer. Meanwhile, inspirations from such cooling in nature were proposed for developing advanced bionic engineering technologies especially with two focuses on therapeutic hypothermia and computer chip cooling areas. It is expected that many innovations can be achieved along this way to find out new cooling methodologies for a wide variety of industrial applications which will be highly efficient, energy saving, flexible or even intelligent.

关键词： brain cooling mechanism bionic engineering biolheat transfer thermal window therapeutic hypothermia techniques chip cooling

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Asymmetric synthesis of L-carnitine from (R)-3-chloro-1,2-propanediol

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Chinese Chemical Letters 2011年第7期22卷 765-767页

作者： xu Qin Li Yun xu Yang Wei Li Wang Bin Hu Hui min xue Tian Yi Zhang xue Tao Zhang Department of Chemistry University of Science and Technology Beijing Beijing 100083 China

A practical chemical synthesis of L-camitine （1） has been accomplished from （R）-3-chloro-1,2-propanediol （（R）-4）, which is a main by-product originated from （R,R）-Salen Co（III） catalyzed hydrolytic kinetic resolution （HKR） of （±）-epichlorohydrin. （R）-4 was utilized as a chiral starting material to prepare the key intermediate cyclic sulfite （（R）-S）. The new synthetic approach demonstrated an efficient utilization of organic by-product for the asymmetric synthesis of bioactive compounds.

关键词： L-Camitine Cyclic sulfite (R)-3-Chloro-1,2-propanediol

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Investigation of the deterioration of passive films in H_2S-containing solutions

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International Journal of minerals,Metallurgy and Materials 2017年第8期24卷 943-953页

作者： Zhu Wang Lei Zhang Xian Tang Zhao-yang Cui Jun-peng xue min-xu Lu Institute of Advanced Materials and Technology University of Science and Technology Beijing Safetech Research Institute

The effect of H_2S on the corrosion behavior of 316 L stainless steel was investigated using electrochemical methods by changing the gas condition from CO_2 to H_2S and then back to CO_2. The presence of H_2S showed an acceleration effect on the corrosion of 316 L stainless steel in comparison with CO_2. The acceleration effect remained even after the complete removal of H_2S by CO_2, indicating that the passive film was irreversibly damaged. X-ray photoelectron spectroscopy(XPS) analysis indicated that the passive film was composed of Cr_2O_3, Fe_2O_3, and FeS_2 after being immersed in H_2S-containing solutions. The semiconducting property of the passive film was then investigated by using the Mott–Schottky approach. The presence of sulfides resulted in higher acceptor and donor densities and thus was responsible for the deterioration of passive films.

关键词： stainless steel passive films hydrogen sulfide corrosion

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Phase-Field Simulation of Sintering Process:A Review

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1165-1204页

作者： ming xue min Yi State Key Laboratory ofMechanics and Control forAerospace Structures&Institute for Frontier Science&Key Laboratory for Intelligent Nano Materials and Devices of ministry of Education&College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing210016China

Sintering,a well-established technique in powder metallurgy,plays a critical role in the processing of high melting point materials.A comprehensive understanding of structural changes during the sintering process is essential for effective product *** phase-field method stands out for its unique ability to simulate these structural *** its widespread application,there is a notable absence of literature reviews focused on its usage in sintering ***,this paper addresses this gap by reviewing the latest advancements in phase-field sintering models,covering approaches based on energy,grand potential,and entropy *** characteristics of various models are extensively discussed,with a specific emphasis on energy-based models incorporating considerations such as interface energy anisotropy,tensor-form diffusion mechanisms,and various forms of rigid particle motion during ***,the paper offers a concise summary of phase-field sintering models that integrate with other physical fields,including stress/strain fields,viscous flow,temperature field,and external electric *** conclusion,the paper provides a succinct overview of the entire content and delineates potential avenues for future research.

关键词： Phase-field model review sintering additive manufacturing

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Synthesis of Mg-Al-carbonate layered double hydroxide by an atom-economic reaction

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Particuology 2010年第3期8卷 198-201页

作者： Xiangyu xu Dianqing Li Jiaqing Song Yanjun Lin Zhi Lv min Wei xue Duan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 China

A clean method for preparing layered double hydroxides （LDHs） has been developed, featured by using the hydroxides of two different metals as starting materials by atom-economic reactions. The reactions were carried out under hydrothermal conditions in either a high pressure autoclave or a microwave digester. The compositions, structural parameters and thermal behavior of the resulting LDHs are very similar to those of materials produced by using the separate nucleation and aging steps （SNAS） method. The major advantage of the new method is that no by-product is produced, so that filtration and washing processes are unnecessary. The consequent reduction in water consumption is beneficial to the environment.

关键词： Layered double hydroxides Atom-economic reaction Clean method Mg(OH)2Al(OH)3

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Bacterial and archaeal communities in the surface sediment from the northern slope of the South China Sea

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第12期10卷 890-901页

作者： Li LIAO xue-wei xu Chun-sheng WANG Dong-sheng ZHANG min WU College of Life Sciences Zhejiang University Hangzhou 310058 China Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration Hangzhou 310012 China The Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China

Microbial diversity of sediments from the northern slope of the South China Sea was studied by constructing bacterial and archaeal 16S rRNA gene clone libraries. Fourteen bacterial phylogenetic groups were detected, including Gammaproteobacteria, Deltaproteobacteria, Planctomycetes, Alphaproteobacteria, Firmicutes, Bacteroidetes, Actinobacteria, Chloroflexi, Acidobacteria, Betaproteobacteria, Nitrospirae, candidate divisions OP8 and OP 11, and an unknown group. Gammaproteobacteria was the predominant group in bacterial libraries with the percentage ranging from 31.8% to 63.2%. However, archaeal libraries had relatively lower diversity, with most clones belonging to marine archaeal group I uncultured Crenarehaeota. In addition, two novel euryarchaeal clones were detected not to match any culture-dependent or -independent isolates. Compared with other gas hydrate-rich ecosystems and different areas of the South China Sea, a distinct microbial community was revealed in this study.

关键词： 16S rRNA Library Diversitv South China Sea

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