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Melilite-derived mineral inclusions in chromite from the Gaositai complex: Implications for an extensional tectonic setting in Early Permian at the north North China Craton

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Science China Earth Sciences 2016年第3期59卷 583-589页

作者： SHAO Ji An TIAN wei wei chun Jing ZHU Wen Ping Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University

The Early Permian mafic-ultramafic concentrically zoned Gaositai intrusion at Chengde, on the northern margin of the North China Craton(NCC), is a cumulative complex emplaced along a giant fracture that penetrates deeply into the continental lithosphere. Melt inclusions are present in chromite crystals from the inner dunite and chromitite zones of the Gaositai complex. The melt inclusions have experienced post-trap crystallization and resulted in multiple mineral phases, including melilite, garnet, phlogopite, magnesite and apatite, which can indicate the liquidus minerals of the primitive magma. The characteristics of the melilite+melanite+clinopyxene assemblage indicate that the primary parental magma was highly undersaturated and derived from an alkali-rich mantle source. The crystallization of phlogopite, magnesite and apatite suggests a primary magma rich in K, H_2O and CO_2. When compared with experimental data, the primary magma of the Gaositai intrusion is concordant with a kamafugite magma originating from partial melting of enriched mantle with H_2O and CO_2 at pressures greater than 2.7 GPa. This magmatic process would have been related to extensional thinning of the continental lithosphere. The Gaositai primary magmas have high Nb/La ratios, which are similar to those of ocean island basalts, but different from arc-related magmas. This suggests that the northern margin of the NCC was not an active continental margin of the Paleo-Asian Ocean subduction zone during the Early Permian: an extensional tectonic setting during the emplacement of the Gaositai intrusion is more likely.

关键词： Melt Inclusion Melilite Primary melt Extension Continental lithosphere North China Craton

Ultrahigh performance concrete–properties, applications and perspectives

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Science China(Technological Sciences) 2015年第4期58卷 587-599页

作者： GU chun Ping YE Guang SUN wei School of Materials Science & Engineering Southeast University Microlab Faculty of Civil Engineering and Geosciences Delft University of Technology Jiangsu Key Laboratory of Construction Materials Collaborative Innovation Center for Advanced Civil Engineering Materials

Over the last twenty years,remarkable advances have taken place in the research and application of ultra-high performance concrete(UHPC),which exhibits outstanding mechanical properties and excellent *** has shown great potential for the next generation infrastructure construction from the sustainability point of *** paper will give an overview on UHPC,with particular focus on the properties,applications and *** several decades of development,several types of commercial UHPC materials are available in the market,and the properties of UHPC have been characterized by numerous experimental and field *** speaking,the performance(*** properties and durability)of UHPC is much better than normal concrete(NC)and high performance concrete(HPC).Therefore,the uses of UHPC are growing all over the world,in both fields of new construction and ***,it is still a special material and technology,which is not worldwide *** some application prospects of UHPC are briefly introduced in the paper,and the efforts,which have to be made to turn UHPC into a widespread‘regular’technology,are *** paper aims to help designers,engineers,architects and infrastructure owners to know the capacities of UHPC and thus to increase the applications of this material.

关键词： UHPC characteristics durability applications perspectives

3D Microfluidic System for Evaluating Inhibitory Effect of Chinese Herbal Medicine Oldenlandia diffusa on Human Malignant Glioma Invasion Combined with Network Pharmacology Analysis

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Chinese Journal of Integrative Medicine 2023年第1期29卷 52-60页

作者： HAN chun-hui MA Jing-yun ZOU wei QU Jia-lin DU Yang LI Na LIU Yong JIN Guo leng Ai-jing LIU Jing Stem Cells Clinical Research Institution the First Affiliated Hospital of Dalian Medical UniversityDalian116011Liaoning ProvinceChina Dalian Innovation Institute of Stem Cell and Precision Medicine Dalian116023Liaoning ProvinceChina Integrated Chinese and Western Medicine Laboratory the First Affiliated Hospital of Dalian Medical UniversityDalian116011Liaoning ProvinceChina Department of Traditional Chinese Medicine the First Affiliated Hospital of Dalian Medical UniversityDalian116011Liaoning ProvinceChina

Objective:To investigate the anti-invasion efficacy of the ethanol extract of Oldenlandia diffusa Will.(EEOD) on a three-dimensional(3D) human malignant glioma(MG) cell invasion and perfusion model based on microfluidic chip culture and the possible mechanism of action of Oldenlandia diffusa Will.(OD).Methods:The comprehensive pharmacodynamic analysis method in this study was based on microfluidic chip 3D cell perfusion culture technology,and the action mechanism of Chinese medicine(CM) on human MG cells was investigated through network pharmacology ***,the components of EEOD were analyzed by ultraperformance liquid chromatography with quadrupole time-of-flight mass spectrometry(UPLC-Q-TOF/MS).Then,cell viability and apoptosis were assessed to determine the optimum concentration of EEOD for invasion experiments,and two-dimensional(2D) migration and invasion abilities of U87 and U251 MG cells were evaluated using scratch wound and Transwell *** possible mechanism underlying the effects of EEOD on glioma was analyzed through a network pharmacology ***:Thirty-five compounds of EEOD were detected by UPLC-Q-TOF/*** suppressed the viability of MG cells,promoted their apoptosis,and inhibited their migratory and invasive potentials(all P<0.05).Network pharmacology analysis showed that OD inhibited the invasion of MG cells by directly regulating MAPK and Wnt pathways through MAPK,EGFR,MYC,GSK3B,and other *** anti-invasion effect of OD was also found to be related to the indirect regulation of microtubule cytoskeleton ***:EEOD could inhibit the invasion of human MG cells,and the anti-invasion mechanism of OD might be regulating MAPK and Wnt signaling pathways and microtubule cytoskeleton organization.

关键词： invasion malignant glioma Oldenlandia diffusa microfluidic chip Chinese medicine

A review on the structure-performance relationship of the catalysts during propane dehydrogenation reaction

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Petroleum Science 2022年第2期19卷 819-838页

作者： Bohan Feng Yue-Chang wei wei-Yu Song chun-Ming Xu State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing102249People's Republic of China

Dehydrogenation of propane(PDH)technology is one of the most promising on-purpose technologies to solve supply-demand unbalance of *** industrial catalysts for PDH,such as Pt-and Cr-based catalysts,still have their own limitation in expensive price and security ***,a deep understanding into the structure-performance relationship of the catalysts during PDH reaction is necessary to achieve innovation in advanced high-efficient *** this review,we focused on discussion of structure-performance relationship of catalysts in *** on analysis of reaction mechanism and nature of active sites,we detailed interaction mechanism between structure of active sites and catalytic performance in metal catalysts and oxide *** relationship between coke deposition,co-feeding gas,catalytic activity and nanostructure of the catalysts are also *** these discussions on the relationship between structure and performances,we try to provide the insights into microstructure of active sites in PDH and the rational guidance for future design and development of PDH catalysts.

关键词： Dehydrogenation of propane Metal catalysts Oxide catalysts Structure-performance relationship Active site Reaction mechanism

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磁性碳微球快速芬顿降解苯酚的研究

化学研究与应用 2025年第1期37卷 183-189页

作者：黄云薇冉源富肖纯操江飞肇庆学院环境与化学工程学院广东肇庆526061 广东省环境健康与资源利用重点实验室广东肇庆526061

本研究以可溶性淀粉为碳源,磁性Fe_(3)O_(4)为赋磁剂,采用简单高效的水热碳化法,并在700℃活化,制备磁性碳微球(Fe_(3)O_(4)@CMSs)。并通过傅立叶红外光谱仪、X射线粉末衍射仪、扫描电镜、X射线光电子能谱、比表面积及孔径分析仪等对所... 详细信息

本研究以可溶性淀粉为碳源,磁性Fe_(3)O_(4)为赋磁剂,采用简单高效的水热碳化法,并在700℃活化,制备磁性碳微球(Fe_(3)O_(4)@CMSs)。并通过傅立叶红外光谱仪、X射线粉末衍射仪、扫描电镜、X射线光电子能谱、比表面积及孔径分析仪等对所得样品进行表征分析。用苯酚溶液模拟有机废液,考察Fe_(3)O_(4)@CMSs的降解性能及可能的降解机理,考察Fe_(3)O_(4)@CMSs的添加量、溶液体系的pH、H_(2)O_(2)用量、温度以及反应时间对苯酚的降解性能影响,研究表明,当苯酚溶液浓度为100 mg·L^(-1),Fe_(3)O_(4)@CMSs的添加量为2 g·L^(-1),溶液pH为5,H_(2)O_(2)添加量为0.6 mL·L^(-1)时,室温下降解5 min,苯酚能够完全降解。通过淬灭实验发现,·O_(2)-、·OH、1O_(2)均参与了反应体系中苯酚的降解,且循环利用实验表明Fe_(3)O_(4)@CMSs循环利用四次后降解率仍有88%以上。

关键词： Fe_(3)O_(4)@CMSs 苯酚水热法降解

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肉品冷链物流监控技术研究进展

食品工业科技 2025年第3期46卷 19-30页

作者：韩彬冷冬梅徐毓谦沈建洋李欣郑晓春王卫张德权侯成立中国农业科学院农产品加工研究所农业农村部农产品质量安全收贮运管控重点实验室北京100193 成都大学食品与生物工程学院肉类加工四川省重点实验室四川成都610106 中国农业科学院农产品加工与营养健康研究院(沧州) 河北沧州061014

我国是肉类生产与消费大国,冷链物流是保证肉品品质的重要手段。随着科技的发展和“十四五”冷链物流规划政策的逐步实施,数字化、信息化和可视化已成为冷链物流发展的重点。然而,实际操作中,冷链物流过程中的温度波动并不能完全避免,... 详细信息

我国是肉类生产与消费大国,冷链物流是保证肉品品质的重要手段。随着科技的发展和“十四五”冷链物流规划政策的逐步实施,数字化、信息化和可视化已成为冷链物流发展的重点。然而,实际操作中,冷链物流过程中的温度波动并不能完全避免,特别是在长距离运输和极端气候条件下,引发“断链”“伪冷链”等问题,导致冷链物流过程肉品品质下降。随着工业4.0技术的快速发展,大数据、物联网和人工智能等先进技术得到了广泛应用。这些技术与各类传感设备的结合,在监控肉品冷链过程中尤其有效,已成为解决相关问题的有效手段。本文从信息感知、信息处理等冷链物流监控关键环节,对肉品冷链物流监控技术进展进行综述,并结合传感器、窄带物联网、机器学习和区块链等新型信息技术,探讨肉品冷链物流监控技术的未来发展趋势,以期为我国肉品冷链物流监控技术的研究与应用提供理论支撑。

关键词：肉品冷链物流断链监控技术追溯

基于VOSviewer和CiteSpace的2014—2023年土壤碳库研究可视化分析

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草地学报 2025年第1期33卷 136-146页

作者：周泽张春平曹铨俞旸魏孔涛董全民青海大学畜牧兽医科学院/青海省畜牧兽医科学院青海省高寒草地适应性管理重点实验室青海大学三江源区高寒草地生态教育部重点实验室青海西宁810016

土壤碳库在全球碳循环和生态系统健康维持方面具有关键作用。为了解土壤碳库的研究趋势和热点,本文基于2014—2023年中国知网和Web of Science数据库发表的8659篇论文,利用VOSviewer和CiteSpace可视化工具,分析了有关土壤碳库研究的论... 详细信息

土壤碳库在全球碳循环和生态系统健康维持方面具有关键作用。为了解土壤碳库的研究趋势和热点,本文基于2014—2023年中国知网和Web of Science数据库发表的8659篇论文,利用VOSviewer和CiteSpace可视化工具,分析了有关土壤碳库研究的论文发表数量、被引频次、研究机构、主要作者和研究热点等。结果表明:近十年间国内外关于土壤碳库的研究论文发文量呈现上升趋势,年均发文量为492.95篇;被引频次最高的中文文献为《土壤碳库构成研究进展》,被引次数为265次,被引频次最高的英文文献为“Total Carbon and Nitrogen in the Soils of the World”,频次为2480次;中英文文献的主要贡献者为我国的科研机构和人员;研究热点聚焦在土壤碳库的组分、稳定性和影响因素等方面;研究趋势逐渐从碳组分研究转向碳库稳定性控制和与生态系统功能的关系探讨。未来研究应重点关注碳库稳定性调控、碳中和策略以及全球变化对碳库的影响。期望本文能够为土壤碳库的研究提供借鉴与参考。

关键词：土壤碳库文献计量 VOSviewer CiteSpace 研究热点

Statistical Measure for Risk-seeking Stochastic Wind Power Offering Strategies in Electricity Markets

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1437-1442页

作者： Dongliang Xiao Haoyong Chen chun wei Xiaoqing Bai School of Electric Power South China University of TechnologyGuangzhou 510641China College of Information Engineering Zhejiang University of TechnologyHangzhouChina School of Electrical Engineering Guangxi UniversityNanningChina

This study proposes a statistical measure and a stochastic optimization model for generating risk-seeking wind power offering strategies in electricity markets. Inspired by the value at risk(VaR) to quantify risks in the worst-case scenarios of a profit distribution, a statistical measure is proposed to quantify potential high profits in the best-case scenarios of a profit distribution,which is referred to as value at best(VaB)in the best-case scenarios. Then, a stochastic optimization model based on VaB is developed for a risk-seeking wind power producer, which is formulated as a mixed-integer linear programming problem. By adjusting the parameters in the proposed model, the wind power producer can flexibly manage the potential high profits in the best-case scenarios from the probabilistic perspective. Finally, the proposed statistical measure and riskseeking stochastic optimization model are verified through case studies.

关键词： Electricity market risk-seeking statistical measure stochastic optimization wind power

Optimization of the cavity beam-position monitor system for the Shanghai soft X-ray free-electron laser user facility

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Nuclear Science and Techniques 2022年第10期33卷 22-32页

作者： Jian Chen Yong-Bin leng Lu-Yang Yu Long-wei Lai Ren-Xian Yuan Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

To achieve high-efficiency operation of the highgain free-electron laser(FEL),the electron beams and radiated photon beams need to be overlapped precisely and pass through the entire undulator ***,a high-resolution beam-position monitor(BPM)is required.A cavity BPM(CBPM)with a resonant cavity structure was developed and used in the Shanghai Soft X-ray FEL(SXFEL)test facility and can achieve a position resolution of<1μ*** construction and operation of the SXFEL user facility also bring about higher requirements for beamposition *** this case,the factors that affect the performance of the CBPM system were further *** included the amplitude and phase stability of the local oscillator,stability of the trigger signal,performance of the radio frequency front-end,signal processing electronics,and signal processing *** on the upgrade and optimization of the system,a beam test platform was built at the end of the linear acceleration section of the SXFEL,and the experimental results show that the position resolution of the system can reach 177 nm at a bunch charge of 500 pC,and the dynamic range is controlled within±300μm,and the relative measurement uncertainty of the bunch charge can reach 0.021%,which are significant improvements compared to the attributes of the previous system.

关键词： Cavity BPM SXFEL System optimization Position resolution Measurement uncertainty Algorithm