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TBAB hydrate formation and growth in a microdevice under static and dynamic conditions

Petroleum Science 2024年第2期21卷 1396-1404页

作者： Xingxun Li Ming Liu qingping Li Weixin Pang Guangjin chen Changyu Sun State Key Laboratory of Heavy Oil Processing China University of Petroleum BeijingBeijing102249China State Key Laboratory of Natural Gas Hydrate CNOOC Research Institute Co.Ltd.Beijing100027China

The natural gas hydrate has become one of the most promising future green energy sources on the earth.The natural gas hydrates mostly exist in the sediments with porous structure, so a solid understanding of the hydrate formation and growth processes in the porous medium is of significance for the exploitation of natural gas hydrate. The micro-packed bed device is one of the efficient microfluidic devices in the engineering field, but it has been rarely used for the hydrate-based research. In this study, a transparent micro-packed bed device filled with glass beads was developed to mimic the porous condition of sediments, and used to in-situ visualize the hydrate formation and growth habits in the pore spaces under both static and dynamic conditions. For the static experiment, two types of hydrate growth patterns in porous medium were observed and identified in the micro-packed bed device, which were the graincoating growth and pore-filling growth. For the dynamic condition, the hydrate formation, growth,distribution habits and hydrate blockage phenomena in the pore spaces were in-situ visually captured.The impacts of flowrate and subcooling on the pressure variation of the micro-packed bed and the duration of the hydrate growth under dynamic flow condition in pores were in-situ monitored and analyzed. The higher flowrate could result in the faster hydrate growth and more severe blockage in pores, but the effect of subcooling condition might be less significant at the high flowrate.

关键词： Hydrate formation Hydrate growth Microdevice In-situ measurement

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circRNAs deregulation in exosomes derived from BEAS-2B cells is associated with vascular stiffness induced by PM_(2.5)

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Journal of Environmental Sciences 2024年第3期137卷 527-539页

作者： qingping Liu Yaling Zhang Bin Han Mengruo Wang Huaifang Hu Jie Ning Wentao Hu Meiyu chen Yaxian Pang Yuanyuan chen Lei Bao Yujie Niu Rong Zhang Department of Toxicology Hebei Medical UniversityShijiazhuang 050017China State Key Laboratory of Environment Health(Incubation) Key Laboratory of Environment and HealthMinistry of EducationKey Laboratory of Environment and Health(Wuhan)Ministry of Environmental ProtectionSchool of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China Occupational Health and Environmental Health Hebei Medical UniversityShijiazhuang 050017China Hebei Key Laboratory of Environment and Human Health Hebei Medical UniversityShijiazhuang 050017China

As an environmental pollutant,ambient fine particulate matter (PM_(2.5)) was linked to cardiovascular diseases.The molecular mechanisms underlying PM_(2.5)-induced extrapulmonary disease has not been elucidated clearly.In this study the ambient PM_(2.5)exposure mice model we established was to explore adverse effects of vessel and potential mechanisms.Long-term PM_(2.5)exposure caused reduced lung function and vascular stiffness in mice.And chronic PM_(2.5)induced migration and epithelial-mesenchymal transition (EMT) phenotype in BEAS-2B cells.After PM_(2.5)treatment,the circRNAs and mRNAs levels of exosomes released by BEAS-2B cells were detected by competing endogenous RNA (ceRNA) array,which contained 1664 differentially expressed circRNAs (DE-circRNAs) and 308 differentially expressed m RNAs (DE-mRNAs).By bioinformatics analysis on host genes of DE-circRNAs,vascular diseases and some pathways related to vascular diseases including focal adhesion,tight junction and adherens junction were enriched.Then,ceRNA network was constructed,and DE-mRNAs in ceRNA network were conducted functional enrichment analysis by Ingenuity Pathway Analysis,which indicated that hsa_circ_0012627,hsa_circ_0053261and hsa_circ_0052810 were related to vascular endothelial dysfunction.Furthermore,it was verified experimentally that Exo^(PM2.5)could induce endothelial dysfunction by increased endothelial permeability and decreased relaxation in vitro.In present study,we investigated in-depth knowledge into the molecule events related to PM_(2.5) toxicity and pathogenesis of vascular diseases.

关键词： Fine particulate matter Vascular stiffness Exosome ceRNA microarray Endothelial dysfunction

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Highly efficient catalyst for 1,1,2-trichloroethane dehydrochlorination via BN_(3) frustrated Lewis acid-base pairs

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Nano Research 2024年第6期17卷 4773-4781页

作者： Yuxue Yue Fangmin Zuo Bolin Wang Xiaoling Xian Jun Tang Haifeng Zhang Zilong Zhang qingping Ke Wei chen School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Industrial Catalysis Institute of Zhejiang University of Technology Hangzhou 310014China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China

In this study,a novel non-metallic carbon-based catalyst co-doped with boron and nitrogen(B,N)was successfully synthesized.By precisely controlling the carbonization temperature of a binary mixed ionic liquid,we selectively modified the doping site structure,ultimately constructing a B,N co-doped frustrated Lewis acid-base pair catalyst.This catalyst exhibited remarkable catalytic activity,selectivity,and stability in the dehydrochlorination reaction of 1,1,2-trichloroethane(TCE).Detailed characterization and theoretical calculations revealed that the primary active center of this catalyst was the BN_(3)configuration.Compared to conventional graphitic N structures,the BN_(3)structure had a higher p-band center,ensuring superior adsorption and activation capabilities for TCE during the reaction.Within the BN_(3)site,three negatively charged nitrogen atoms acted as Lewis bases,while positively charged boron atoms acted as Lewis acids.This synergistic interaction facilitated the specific dissociation of chlorine and hydrogen atoms from TCE,significantly enhancing the 1,1-dichloroethene selectivity.Through this research,we not only explored the active site structure and catalytic mechanism of B,N co-doped catalysts in depth but also provided an efficient,selective,and stable catalyst for the dehydrochlorination of TCE,contributing significantly to the development of non-metallic catalysts.

关键词： B N co-doped sites dehydrochlorination frustrated Lewis acid-base pairs catalytic mechanism

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Novel Ag-bridged dual Z-scheme g-C_(3)N_(4)/BiOI/AgI plasmonic heterojunction: Exceptional photocatalytic activity towards tetracycline and the mechanism insight

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Journal of Environmental Sciences 2023年第9期131卷 123-140页

作者： Wenxia Wang Zhen Li Kailin Wu Guodong Dai qingping chen Lihua Zhou Junxia Zheng Liang Ma Guiying Li Wanjun Wang Taicheng An School of Biomedical and Pharmaceutical Sciences Guangdong University of TechnologyGuangzhou 510006China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and HealthInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Guangzhou Key lab of Clean Transport Energy and Chemistry Guangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control Guangdong Technology Research Center for Photocatalytic Technology Integration and Equipment EngineeringSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China

Rational design and synthesis of highly efficient and robust photocatalysts with positive exciton splitting and interfacial charge transfer for environmental applications is critical.Herein,aiming at overcoming the common shortcomings of traditional photocatalysts such as weak photoresponsivity,rapid combination of photo-generated carriers and unstable structure,a novel Ag-bridged dual Z-scheme g-C_(3)N_(4)/BiOI/AgI plasmonic heterojunction was successfully synthesized using a facile method.Results showed that Ag-AgI nanoparticles and three-dimensional(3D)BiOI microspheres were decorated highly uniformly on the 3D porous g-C_(3)N_(4) nanosheet,resulting in a higher specific surface area and abundant active sites.The optimized 3D porous dual Z-scheme g-C_(3)N_(4)/BiOI/Ag-AgI manifested exceptional photocatalytic degradation efficiency of tetracycline(TC)in water with approximately 91.8%degradation efficiency within 165 min,outperforming majority of the reported g-C_(3)N_(4)-based photocatalysts.Moreover,g-C_(3)N_(4)/BiOI/Ag-AgI exhibited good stability in terms of activity and structure.In-depth radical scavenging and electron paramagnetic resonance(EPR)analyses confirmed the relative contributions of various scavengers.Mechanism analysis indicated that the improved photocatalytic performance and stability were ascribed to the highly ordered 3D porous framework,fast electron transfer of dual Z-scheme heterojunction,desirable photocatalytic performance of BiOI/AgI and synergistic effect of Ag plasmas.Therefore,the 3D porous Z-scheme g-C_(3)N_(4)/BiOI/Ag-AgI heterojunction had a good prospect for applications in water remediation.The current work provides new insight and useful guidance for designing novel structural photocatalysts for environment-related applications.

关键词： Three-dimensional Porous heterostructure Graphitic carbon nitride(g-C_(3)N_(4)) Dual Z-scheme heterojunction Tetracycline(TC)degradation Mechanism insight

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2014—2019年东江干流氮磷通量传输特征与源解析

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环境科学学报 2024年第3期44卷 139-149页

作者：杜青平程浩高伟陈岩张远广东工业大学生态环境与资源学院大湾区城市环境安全与绿色发展教育部重点实验室广州510006 生态环境部环境规划院国家环境保护环境规划与政策模拟重点实验室北京100012

东江是华南地区主要水源地之一,其河流氮、磷通量变化对珠江口富营养化和重要城市供水安全具有重要影响.针对东江干流氮、磷通量的复杂变化及其来源贡献不清问题,基于LOADEST模型对2014—2019年东江干流上下游氮、磷逐日通量进行模拟,结... 详细信息

东江是华南地区主要水源地之一,其河流氮、磷通量变化对珠江口富营养化和重要城市供水安全具有重要影响.针对东江干流氮、磷通量的复杂变化及其来源贡献不清问题,基于LOADEST模型对2014—2019年东江干流上下游氮、磷逐日通量进行模拟,结合LAM模型解析氮、磷来源与贡献,评估东江干流氮、磷通量的时空演变规律及其多尺度污染源结构特征.结果表明:①2014—2019年东江氮、磷年均通量分别为1890 kg·km^(-2)和77 kg·km^(-2),位居国内外主要江河的高位;②东江氮、磷通量从上游到下游呈指数增长趋势,氮、磷通量的时间累积关系呈凸弧曲线,具有显著的瞬时高通量特征;③东江干流的氮、磷输入以非点源为主,76.8%以上的氮和94.7%以上磷来源于非点源,虽然汛期和非汛期有所差异,但非点源是东江干流氮、磷的主导来源.

关键词：氮磷通量 LOADEST 时空变化东江 LAM 源解析

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益生菌冷冻干燥高活性保护机制研究进展

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微生物学报 2024年第5期64卷 1402-1416页

作者：吴家琳李滢刘振杰陈谋通吴清平广东省科学院微生物研究所华南应用微生物国家重点实验室、广东省微生物安全与健康重点实验室、国家卫健委微生物食品营养与安全科技创新平台广东广州510070 华南农业大学食品学院广东广州510642

摄取足量益生菌有助于维持肠道微生物群落的稳态,对维持人体肠道健康具有重要意义。然而,在工业化应用中,益生菌抗逆能力较弱且对储存条件要求高,导致益生菌产品对运输和活性维持条件要求较高,这些产业需求对高活力益生菌的制备工艺提... 详细信息

摄取足量益生菌有助于维持肠道微生物群落的稳态,对维持人体肠道健康具有重要意义。然而,在工业化应用中,益生菌抗逆能力较弱且对储存条件要求高,导致益生菌产品对运输和活性维持条件要求较高,这些产业需求对高活力益生菌的制备工艺提出了挑战。干燥处理常应用于保持益生菌活性和稳定性,其中冷冻干燥技术应用最广泛,但冻干过程中益生菌会受到各类环境压力的刺激,引起细胞损伤甚至死亡。因此,可以显著提高益生菌存活率的冻干保护剂成为目前益生菌工业应用的研究热点。本文从益生菌常用及新发现的冻干保护剂种类及其作用机制进行了系统归纳,对菌株冻干后细胞存活率的影响因素进行全面综述,并对冻干保护剂研究方向进行了展望,旨在为高活力益生菌冻干菌粉的研制提供理论支持。

关键词：益生菌冷冻干燥冻干保护剂生理状态脂肪酸调控

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基于OBE理念的应用型本科院校食品工程生产实践案例教学体系构建

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食品工业科技 2024年第5期45卷 349-356页

作者：黄业传简清梅张喜才朱德艳陈清婵易庆平荆楚理工学院生物工程学院湖北荆门448000

OBE(Outcome Based Education,成果导向教育)教学理念已成全球共识,也是工程教育认证的核心理念之一。应用型本科院校定位服务地方产业,培养当地产业需求的应用型人才。案例教学是一种让学生积极主动参与课堂、提升教学效果的有效方式... 详细信息

OBE(Outcome Based Education,成果导向教育)教学理念已成全球共识,也是工程教育认证的核心理念之一。应用型本科院校定位服务地方产业,培养当地产业需求的应用型人才。案例教学是一种让学生积极主动参与课堂、提升教学效果的有效方式。在食品科学与工程领域,绝大多数案例教学均与食品安全事件有关,而生产实践类案例教学较为缺乏。作者及团队成员在OBE理念指导下,探索开发和实施食品工程类生产实践案例教学的方法。为完善案例教学的实际效果,在夯实学生基础知识的前提下,继续引导学生在某一特定领域开展综合实验、生产实习及毕业论文,打造“基础知识-案例教学-综合实验-生产实习-毕业论文”一体化特色培养体系,进而提升学生专业综合素质,培养高水平应用型人才。

关键词： OBE理念案例教学食品工程生产实践

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封面故事

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地球学报 2024年第2期45卷 266-266页

作者：陈伟刘青枰

西藏鑫龙金矿钻探现场及矿石特征。创新应用斑岩-浅成低温热液成矿理论,集成遥感高光谱、化探和物探技等术方法手段,首次在西藏陆相火山区发现了高硫化浅成低温热液型金矿-鑫龙金矿,且成矿潜力大(主矿体视厚度达55 m,真厚度约10.5m,平...

西藏鑫龙金矿钻探现场及矿石特征。创新应用斑岩-浅成低温热液成矿理论,集成遥感高光谱、化探和物探技等术方法手段,首次在西藏陆相火山区发现了高硫化浅成低温热液型金矿-鑫龙金矿,且成矿潜力大(主矿体视厚度达55 m,真厚度约10.5m,平均品位17.97 g/t)。鑫龙金矿的发现为西藏乃至全国陆相火山岩区浅成低温热液型金矿找矿开启了新的篇章。这项由中国地质科学院矿产资源研究所唐菊兴院士团队完成的研究成果,

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Bioinspired Multi-Metal Structures Produced via Direct Ink Writing

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Journal of Bionic Engineering 2022年第6期19卷 1578-1588页

作者： Chao Xu Xiang chen Wenzheng Wu qingping Liu Luquan Ren Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchun130000China Weihai Institute of Bionics Jilin UniversityWeihai264400China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130000China

Bioinspired Multi-Metal Structures(MMSs)combine distinct properties of multiple materials,benefiting from improved properties and providing superior designs.Additive Manufacturing(AM)exhibits enormous advantages in applying different materials and geometries according to the desired functions at specific locations of the structure,having great potential in fabricating multi-materials structures.However,current AM techniques have difficulty manufacturing 3D MMSs without material cross-contamination flexibly and reliably.This study demonstrates a reliable,fast,and flexible direct ink writing method to fabricate 3D MMSs.The in-situ material-switching system enables the deposition of multiple metallic materials across different layers and within the same layer.3D Fe-Cu MMSs with complex geometries and fine details are fabricated as proof of concept.The microstructures,chemical and phase compositions,and tensile fracture surfaces of the Fe-Cu interfaces indicate a well-bonded interface without cracks,delamination,or material cross-contamination.We envision this novel method making other metallic combinations and even metal-ceramic components.It paves the way for manufacturing 3D MMSs using AM and establishes the possibilities of numerous MMSs applications in engineering fields.

关键词： Bioinspired Bionic Multi-metal structure(MMS) Direct ink writing(DIW)Additive manufacturing(AM)

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Performance analysis of multi-group three-tuple cross-eye jamming

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Journal of Systems Engineering and Electronics 2022年第1期33卷 80-90页

作者： chen Jiabei SHI Qingzhan HUANG Zhaoyu WANG qingping YUAN Naichang State Key Laboratory of Complex Electromagnetic Environmental Effects of Electronics and Information System National University of Defense TechnologyChangsha 410000China

Monopulse radar is widely used in military.Jamming monopulse radar has always been a research hotspot in electronic warfare(EW).Cross-eye jamming has always been considered as the most effective measures to jam with monopulse radar.In this paper, we propose a multi-group three-tuple crosseye jamming structure where each group contains three antenna elements with a definite phase and an amplitude relationship.Then, based on the principle of monopulse angle measurement, the error angle is deduced theoretically.Simulations show that such a multi-group three-tuple cross-eye jamming structure performs better than the multi-element cross-eye jamming structure previously proposed, and the analysis of the centroid shows that the centroid of the structure proposed in this paper is more widely distributed in space.

关键词： electronic warfare(EW) angular deception jamming cross-eye jamming three-tuple antenna array near field

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