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Two-dimensional semiconductor heterostructures for photocatalytic CO_(2)conversion

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Science China Chemistry 2024年第8期67卷 2434-2447页

作者： Yang wu Mingyu wu Yongfu Sun Yi Xie Hefei National Research Center for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The CO_(2)reduction into carbon-contained fuel via solar energy offers the powerful tools to realize the zero-emission carbon *** to the intriguing features of the two-dimensional(2D)heterostructures,it is susceptible to modulate the electronic structure as well as the surface geometry for optimizing the photocatalytic CO_(2)*** this perspective,we surveyed the fundamental insights of 2D semiconductor heterostructures,involving the fabrication strategies and classification of the 2D semiconductor ***,we have detailly discussed the overview of 2D semiconductor heterostructure for optimizing CO_(2)photocatalytic influenced factors,including the solar energy utilization,photogenerated carriers separation,and redox reaction ***,we showed the significant advantages of 2D heterostructures in elevating CO_(2)photoreduction performance,focusing on activity,selectivity and *** analyzing the limitations and developments,we ended by putting forward insights into the further researches about the CO_(2)photocatalysts and reactor design,even industrial applications.

关键词： two-dimensional semiconductor heterostructures photocatalysis CO_(2)conversion

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柴油淹没射流特性的试验

内燃机学报 2018年第6期36卷 512-517页

作者：仇滔陈新宇刘雨薇吴成林高壮郭鹏北京工业大学环境与能源工程学院北京100124 北京电动车辆协同创新中心北京100081 中国矿业大学(北京)机电与信息工程学院北京100083

高压共轨喷油器控制腔为燃油淹没射流,由于压差变化大,该淹没射流常伴随空化.笔者设计了一套柴油圆管喷孔淹没射流装置,研究了不同进/出口压力改变后的射流规律.试验过程中,采用内窥镜拍摄到圆管出口的空化过程,并且对挡板上的射流冲击... 详细信息

高压共轨喷油器控制腔为燃油淹没射流,由于压差变化大,该淹没射流常伴随空化.笔者设计了一套柴油圆管喷孔淹没射流装置,研究了不同进/出口压力改变后的射流规律.试验过程中,采用内窥镜拍摄到圆管出口的空化过程,并且对挡板上的射流冲击力进行测量.结果表明:随出口压力的降低,空化首先在圆管内发生,并向出口延伸,根据空化是否发展到喷孔出口可将淹没射流分为两个阶段:第一阶段,空化没有发展到喷孔出口,随着出口压力的降低,射流冲击力不断增加,最大冲击力出现在空化达到喷孔出口截面时;第二阶段,空化离开喷孔出口并进入背景流体,随出口压力降低,淹没射流冲击力减小,并最终趋于稳定;随着入口压力的提高,淹没射流冲击力的最大值以及进/出口最大压差下的稳定冲击力均先增大之后保持不变.

关键词：淹没射流冲击力空化

民主社会主义与中国特色社会主义之比较及启示

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山西高等学校社会科学学报 2017年第2期29卷 21-25,47页

作者：吴成林广西民族大学政治与公共管理学院广西南宁530006

民主社会主义作为全球颇具影响力的社会思潮,其实质是一种改良的资本主义,与坚持科学社会主义基本原则的中国特色社会主义截然不同。从比较的视野来审视民主社会主义的发展历程,在思想文化基础、基本价值观、经济发展程度、政治制度等... 详细信息

民主社会主义作为全球颇具影响力的社会思潮,其实质是一种改良的资本主义,与坚持科学社会主义基本原则的中国特色社会主义截然不同。从比较的视野来审视民主社会主义的发展历程,在思想文化基础、基本价值观、经济发展程度、政治制度等方面分析民主社会主义与中国特色社会主义的区别,对于正确认识民主社会主义,促进中国特色社会主义的发展,坚定中国特色社会主义的道路自信、理论自信、制度自信、文化自信具有重要意义。

关键词：民主社会主义中国特色社会主义科学社会主义

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黑社会性质组织与保护伞勾结模式研究

警学研究 2019年第6期 21-30页

作者：于阳吴承麟天津大学法学院

黑社会性质组织与保护伞勾结的问题由来已久,但如何防范黑恶势力对国家机关的侵蚀,防止黑恶势力与贪腐势力的勾结亟待进行有效的、系统性的研究。"扫黑除恶"专项行动深入开展以来,随着全国各地黑社会性质组织的瓦解与惩治,黑社会性质组... 详细信息

黑社会性质组织与保护伞勾结的问题由来已久,但如何防范黑恶势力对国家机关的侵蚀,防止黑恶势力与贪腐势力的勾结亟待进行有效的、系统性的研究。"扫黑除恶"专项行动深入开展以来,随着全国各地黑社会性质组织的瓦解与惩治,黑社会性质组织与保护伞勾结的方式也呈现出隐蔽化、基层化和固定化的发展新趋势。运用大数据研究黑社会性质组织与贪腐分子间同步发展、初步勾结辩证关系的基础上,深刻分析其勾结的特点并予以类型化;再从经济分析、行政监督以及国际视角对黑社会性质组织与保护伞勾结的原因进行深入分析;最后,从完善国家工作人员工作制度、加强公众参与度等方面提出切断黑社会性质组织与贪腐分子之间的联系,并有针对性地提出惩治黑恶势力和贪腐势力的应对之策。

关键词：黑社会性质组织保护伞勾结模式贪污贿赂腐败犯罪

用于高(焦)炉煤气风机的非接触螺旋槽干气密封的设计与分析

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机械工程学报 2005年第9期41卷 194-197页

作者：徐万福刘雨川李福春吴成林沈阳理工大学万得孚工业公司沈阳110016 美国西北大学艾凡斯顿60208 四平鼓风机厂技术中心四平136001 攀枝花钢铁(集团)公司动力分厂攀枝花617062

论述了高(焦)炉煤气离心风机的转轴密封正被干运行非接触气体密封所取代的技术趋势。针对干式布袋除尘反吹煤气风机转速低、压力波动频繁的难点,设计了非接触螺旋槽干气密封,包括高刚度目标的螺旋槽型优化、干气密封零压力开启转速和角... 详细信息

论述了高(焦)炉煤气离心风机的转轴密封正被干运行非接触气体密封所取代的技术趋势。针对干式布袋除尘反吹煤气风机转速低、压力波动频繁的难点,设计了非接触螺旋槽干气密封,包括高刚度目标的螺旋槽型优化、干气密封零压力开启转速和角向动态失稳界限频率的分析、关键零件功能结构的选取以及干气密封支持系统的确定等。按照美国石油协会(API)617的规定及沈阳万得孚工业公司的标准对所设计的干气密封进行了性能检验和试验,并经历了工业现场令人满意的运行。

关键词：干运行非接触气体密封螺旋槽干气密封高(焦)炉煤气离心风机

Rational surface charge engineering of haloalkane dehalogenase for boosting the enzymatic performance in organic solvent solutions

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Chinese Journal of Chemical Engineering 2024年第1期65卷 276-285页

作者： Yin wu Yan Sun Department of Biochemical Engineering School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(Ministry of Education)Tianjin UniversityTianjin 300350China

Biocatalysis in organic solvents(OSs)has numerous important applications,but native enzymes in OSs often exhibit limited catalytic ***,we proposed a computation-aided surface charge engineering strategy to improve the catalytic performance of haloalkane dehalogenase DhaA in OSs based on the energetic analysis of substrate binding to the DhaA *** variants with enhanced OS resistance were obtained by replacing negative charged residues on the surface with positive charged residue(Arg).Particularly,a four-substitution variant E16R/E93R/E121R/E257R exhibited the best catalytic performance(five-fold improvement in OS resistance and seven-fold half-life increase in 40%(vol)dimethylsulfoxide).As a result,the overall catalytic performance of the variant could be at least 26 times higher than the wild-type *** spectroscopy and molecular dynamics simulation studies revealed that the residue substitution mainly enhanced OS resistance from four aspects:(a)improved the overall structural stability,(b)increased the hydrophobicity of the local microenvironment around the catalytic triad,(c)enriched the hydrophobic substrate around the enzyme molecule,and(d)lowered the contact frequency between OS molecules and the catalytic *** findings validate that computationaided surface charge engineering is an effective and ingenious rational strategy for tailoring enzyme performance in OSs.

关键词： Surface charge engineering Organic solvent resistance Molecular dynamics simulation Haloalkane dehalogenase

The Functional Redundancy of Neddylation E2s and E3s in Modulating the Fitness of Regulatory T Cells

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Research 2024年第2期2023卷 373-387页

作者： Di wu Yi Sun Cancer Institute(Key Laboratory of Cancer Prevention and Intervention China National Ministry of Education)of the Second Affiliated Hospital and Institute of Translational MedicineZhejiang University School of MedicineHangzhou 310029China Cancer Center of Zhejiang University Hangzhou 310029China Zhejang Provincial Clinical Research Center for Cancer Zhejang ProvinceChina Key Laboratory of Molecular Biology in Medical Sciences Zhejang ProvinceChina Research Center for Life Science and Human Health Binjiang Institute of Zhejiang UniversityHangzhou 310053China

Neddylation is necessary for activation of Cullin-RING ligases(CRLs),which degrade various immune regulatory *** recent study showed that while depletion of neddylation E2-E3 pair Ube2f-Sag in regulatory T(T_(reg))cells had no obvious phenotype,the same depletion of either Ube2m or Rbx1 caused inflammation disorders with different *** these E2s or E3s compensate each other in functional regulations of T_(reg)cells is,however,previously *** this report,we generated Foxp3^(Cre);Ube2m^(fl/fl);Ube2f^(fl/fl)or Foxp3^(Cre);Rbx1^(fl/fl);Sag^(fl/fl)double-null mice by simultaneous deletion of both neddylation E2s or E3s in T_(reg)cells,***,Ube2m&Ube2f double-null mice developed much severe autoimmune phenotypes than did Ube2m-null mice,indicating that Ube2m markedly compensates Ube2f in T_(reg)*** minor worsened autoimmune phenotypes seen at the very early stage in Rbx1&Sag double-null than Rbx1-null mice is likely due to already severe phenotypes of the later,indicating a minor compensation of Rbx1 for *** RNA profiling-based analyses revealed that up-and down-regulations of few signaling pathways in T_(reg)cells are associated with the severity of autoimmune ***,severer inflammation phenotypes seen in mice with double E3-null than with double E2-null T_(reg)cells indicate a neddylation-independent mechanism of 2 E3s,also known to serve as the RING component of CRLs in regulation of T_(reg)cell fitness.

关键词： Foxp3 inflammation markedly

Optical Microsphere Nano-Imaging:Progress and Challenges

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Engineering 2024年第5期36卷 102-123页

作者： Guangxing wu Minghui Hong Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

The optical diffraction effect imposes a radical obstacle preventing conventional optical microscopes from achieving an imaging resolution beyond the Abbe diffraction limit and thereby restricting their usage in a multitude of nanoscale *** the past decade,the optical microsphere nanoimaging technique has been demonstrated to be a cost-effective solution for overcoming the diffraction limit and has achieved an imaging resolution of up to about k6k8 in a real-time and label-free manner,making it highly competitive among numerous super-resolution imaging *** this review,we summarize the underlying nano-imaging mechanisms of the microsphere nanoscope and key advancements aimed at imaging performance enhancement:first,to change the working environment or modify the peripheral hardware of a single microsphere nanoscope at the system level;second,to compose the microsphere compound lens;and third,to engineer the geometry or ingredients of *** also analyze challenges yet to be overcome in optical microsphere nano-imaging,followed by an outlook of this technique.

关键词： Microsphere Nano-imaging Virtual imaging Microsphere compound lens Engineered microsphere

Dual-ion carrier storage through Mg^(2+) addition for high-energy and long-life zinc-ion hybrid capacitor

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 179-185页

作者： Junjie Zhang Xiang wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Cation additives can efficiently enhance the total electrochemical capabilities of zinc-ion hybrid capacitors (ZHCs).However their energy storage mechanisms in zinc-based systems are still under ***,we modulate the electrolyte and achieve dual-ion storage by adding magnesium *** we assemble several Zn//activated carbon devices with different electrolyte concentrations and investigate their electrochemical reaction dynamic *** zinc-ion capacitor with Mg^(2+)mixed solution delivers 82 mAh·g^(-1)capacity at 1 A·g^(-1) and maintains 91%of the original capacitance after 10000 *** is superior to the other assembled zinc-ion devices in single-component *** finding demonstrates that the double-ion storage mechanism enables the superior rate performance and long cycle lifetime of ZHCs.

关键词： zinc-ion hybrid capacitor MgSO_(4) electrolyte rate performance storage mechanism