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Influence of oxygen-rich hot air composite gas medium on sintering performance and function mechanism

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1071-1081页

作者： Min Gan Hao-xiang Zheng Xiao-hui Fan Zhi-yun Ji Qiang Li Ming Wu Yi-fan Wang Xiao-long Wang Yu-feng Wu xu-ling chen Zeng-qing Sun Xiao-xian Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Shanxi Taigang Stainless Steel Co. Ltd.Taiyuan030003ShanxiChina

Hot air sintering technology is used to improve the quality and production efficiency of sintered ***,the current thick layer condition highlights the disadvantage of the low oxygen potential of the hot air sintering ***,it is considered to use oxygen enrichment sintering to improve the environment of hot air *** sintering,hot air sintering,and oxygen-rich hot air sintering were compared through sintering cup experiments,and the influence of hot air and oxygen-rich hot air on sintering indexes was *** air reduced the vertical sintering velocity,while improved the yield and tumbler ***-rich hot air sintering contributed to improving the vertical sintering velocity while ensuring the quality of sintered ore,thus comprehensively improving production *** the action of hot air,the highest temperature of the sintering layer increased and the high-temperature holding time was *** oxygen enrichment,the combustion efficiency of fuels in the upper layer of materials was promoted,which optimized heat distribution in the middle and lower layers of materials and increased the content of calcium ferrite in the sintered ore,thus strengthening the sintering process.

关键词： Iron ore sintering Hot air sintering Oxygen enrichment Function mechanism

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薄膜微盘激射性质

物理学报 2024年第8期73卷 105-114页

作者：徐宇轩姚泰宇邓莉陈诗枚徐辰尧唐文轩华东师范大学物理与电子科学学院上海200241

基于半导体变形微腔的定向激射效应,在各向同性薄膜中制备变形微腔,将为多功能、高集成光子有源芯片提供新的解决方案.利用二维波动光学理论,以Z切向掺饵铌酸锂薄膜蚶线形微盘中的TE20,1模式为例,分析了不同变形因子ε微盘的模式分布、... 详细信息

基于半导体变形微腔的定向激射效应,在各向同性薄膜中制备变形微腔,将为多功能、高集成光子有源芯片提供新的解决方案.利用二维波动光学理论,以Z切向掺饵铌酸锂薄膜蚶线形微盘中的TE20,1模式为例,分析了不同变形因子ε微盘的模式分布、品质因子Q、定向激射效果D以及庞加莱截面图.理论模拟结果显示,微盘变形过程中微盘周长与谐振波长的比值近似为一定值.当ε大于0.24时,微盘具有较好的单向激射性,Q值大于10^(5);当ε变形因子大于0.4时,庞加莱截面图几乎被混沌海区域占据,Q值低于10^(3).因此,薄膜蚶线形微盘变形因子ε在0.24—0.4之间时,微盘不仅具有高的品质因子(Q值为10^(3)—10^(5)),激射方向性也较高(D值为6.45—8.32).

关键词：蚶线形微盘模式分布品质因子定向激射

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国外主战舰载电子战装备发展特点及启示

舰船科学技术 2024年第9期46卷 176-180页

作者：陈波陈旭中国人民解放军91977部队北京100036

第四次中东战争,埃及、叙利亚导弹艇攻击以色列舰艇的“冥河”导弹受干扰无一命中目标,反舰导弹与电子战的博弈正式走上舞台。随着反舰导弹制导技术的发展进步,水面舰艇面临的威胁日益凸显。为提升应对能力,主要军事强国不断完善舰载电... 详细信息

第四次中东战争,埃及、叙利亚导弹艇攻击以色列舰艇的“冥河”导弹受干扰无一命中目标,反舰导弹与电子战的博弈正式走上舞台。随着反舰导弹制导技术的发展进步,水面舰艇面临的威胁日益凸显。为提升应对能力,主要军事强国不断完善舰载电子战装备体系、提升反导对抗能力。通过分析外军装备情况及主要特点,为我军装备建设发展提供借鉴和参考。

关键词：舰载电子战装备反舰导弹制导技术装备建设

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二氧化碳缓蚀剂的研究进展

表面技术 2024年第11期53卷 117-126页

作者：王欣彤杨江陈旭辽宁石油化工大学石油化工学院辽宁抚顺113001 辽宁石油化工大学石油天然气工程学院辽宁抚顺113001 中国石油大学(华东)化学化工学院山东青岛266000

为了有效应对全球气候变暖达到碳中和的目标,碳捕集、利用与封存(CCUS)技术被大力推广和应用。CCUS过程,油气开发和集输过程始终面临着严重的二氧化碳(CO_(2))腐蚀问题。CO_(2)腐蚀会带来严重的经济损失、环境污染和人身安全等问题。相... 详细信息

为了有效应对全球气候变暖达到碳中和的目标,碳捕集、利用与封存(CCUS)技术被大力推广和应用。CCUS过程,油气开发和集输过程始终面临着严重的二氧化碳(CO_(2))腐蚀问题。CO_(2)腐蚀会带来严重的经济损失、环境污染和人身安全等问题。相比于采用昂贵的合金材料防腐措施,在普通碳钢基础上添加缓蚀剂是应对CO_(2)腐蚀较为简单、经济的防腐方法之一。总结了近几年不同类型CO_(2)缓蚀剂的研究进展,包括传统的含有N、O、S、P等杂原子的有机缓蚀剂,含有杂环的有机缓蚀剂,具有两亲性的表面活性剂类缓蚀剂,新型无机纳米材料类缓蚀剂(如石墨烯、碳量子点、离子液体和金属配合物等),以及植物提取物、氨基酸、天然油和生物聚合物等天然型绿色环保缓蚀剂。分析了这些不同缓蚀剂的优缺点和适用性,并讨论了这些缓蚀剂的研究现状。同时,总结了缓蚀剂构效关系和协同效应的研究热点及其存在的问题。最后针对这些不同缓蚀剂的特点和研究现状,对未来CO_(2)缓蚀剂的研究方向进行了分析与展望。

关键词：二氧化碳腐蚀缓蚀剂表面活性剂协同增效

Glycine Attenuates Myocardial Fibrosis in Myocardial Infarction in Rats Partly through Modulating Signal Transducer and Activator of Transcription 3/Nuclear Factor-κB/Transforming Growth Factor-β axis

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World Journal of Traditional Chinese Medicine 2024年第2期10卷 263-270页

作者： Ning Li Yong Wang Chun Li xu chen xue-Feng Zhang Nan Nan Tan Yi-Qin Hong Ming-Yan Shao Bing-Hua Tang Dong-Qing Guo School of Life Science Beijing University of Chinese MedicineBeijingChina College of Traditional Chinese Medicine Beijing University of Chinese MedicineBeijingChina Modern Research Center of Traditional Chinese Medicine School of Traditional Chinese Material MedicaBeijing University of Chinese MedicineBeijingChina

Objective: Inflammation and fibrosis are strongly associated with each other. Glycine is present in various traditional Chinese medicines and exhibits anti-inflammatory activity. However, the effects of glycine on myocardial fibrosis(MF) in rats with myocardial infarction(MI) have not been reported. The purpose of this study is to investigate the effects of glycine therapy on MF and comprehend its underlying mechanisms. Materials and Methods: Left anterior descending artery ligation-induced MI in Sprague Dawley rats was leveraged to assess the therapeutic effects of Glycine. Rats received either normal saline or glycine(0.5 mg/g bodyweight) for 7 days. Results: Glycine upregulated cardiac ejection fraction and fractional shortening to improve cardiac function, as evaluated by echocardiography. Histological and immunohistochemical analyses demonstrated that glycine could decrease inflammatory cell infiltration and alleviate collagen deposition. Western blotting revealed that nuclear factor-κB(NF-κB)-mediated inflammatory signaling was also downregulated by glycine treatment. The expression of signal transducer and activator of transcription 3(STAT3), tumor necrosis factor-α, and transforming growth factor-β(TGF-β) was decreased significantly in the glycine-treated group compared to the model group. Thus, glycine plays a protective role against myocardial ischemia and subsequent MF. Conclusion: The protective effects of glycine were achieved partly through STAT3/NF-κB/TGF-β signaling pathway.

关键词： Glycine myocardial fibrosis signal transducer and activator of transcription 3/nuclear factor-κB/transforming growth factor-β

PRC2 primes bivalent genes for transcription induction independent of histone methyltransferase activity

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Science China Life Sciences 2024年第09期 2033-2035页

作者： Meihan Gong Ye Yuan Zhongye Dai xuejiao Lv Jiacheng Su Dawei Huo Lin Niu xu chen xudong Wu State Key Laboratory of Experimental Hematology The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics Key Laboratory of Immune Microenvironment and Disease (Ministry of Education) Department of Cell Biology School of Basic Medical Sciences Tianjin Medical University Bone Marrow Transplantation Center the First Affiliated Hospital Zhejiang University School of Medicine Liangzhu Laboratory Institute of Hematology Zhejiang University

Dear Editor,Polycomb group proteins, conserved epigenetic transcriptional repressors, are crucial for orchestrating diverse developmental gene expression programs(Schuettengruber et al., 2017). The polycomb repressive complex 2(PRC2) catalyzes H3 lysine-27 trimethylation(H3K27me3) to establish a delicate balance with H3K4me3, forming a bivalent chromatin state at target gene promoters and thereby poising them for subsequent transcription activation(Bernstein et al.,2006).

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法律实证主义的价值论问题——制度法论的解决方案与反思

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河南师范大学学报(哲学社会科学版) 2024年第1期51卷 45-52页

作者：郭栋陈旭浙江大学光华法学院

“是”与“应当”的二分自休谟提出以来，经过康德的阐发而逐渐渗透到法哲学研究领域，构成法律实证主义理论脉络中的隐匿线索。制度法论通过“制度事实”的概念架起了事实与规范之间的理论联系，运用法律原则的工具实现了价值与规范的... 详细信息

“是”与“应当”的二分自休谟提出以来，经过康德的阐发而逐渐渗透到法哲学研究领域，构成法律实证主义理论脉络中的隐匿线索。制度法论通过“制度事实”的概念架起了事实与规范之间的理论联系，运用法律原则的工具实现了价值与规范的汇合，借助实践理性的范畴消解了事实与价值的背景差异。制度法论尝试构建一种融合事实、规范和价值的法律理论分析框架，以法律体系的开放性来回应价值论意义上的休谟问题。然而，“原始事实”与“制度事实”的二分无法有效地回应规范命题，“制度事实”的概念是对规范与价值间界限的混淆，规则体系在事实的前提中隐晦地演绎出规范性的内涵。制度法论虽然立意新颖，观点独特，但仍然陷入了事实、规范与价值的纠缠。

关键词：休谟问题法律实证主义制度法论制度事实

Application of carbon-supported single-atom catalysts for electrochemical reactions

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新型炭材料(中英文) 2024年

作者： WANG Yi-cheng MA Xiao-bo Ayeza WANG chen-xu LI Yang YANG cheng-long WANG Zhe-fan WANG Chao HU Chao ZHANG Ya-ting Xi'an Thermal Power Research Institute Co. Ltd. College of Chemistry and Chemical Engineering Xi'an University of Science and Technology Tsinghua Shenzhen International Graduate School Tsinghua University School of Chemical Engineering and Technology Xi'an Jiaotong University

The recent advances in carbon-supported single-atom catalysts (SACs) for electrochemical reactions are comprehensively reviewed. The development and advantages of carbon-supported SACs are briefly introduced, followed by a detailed summary of the synthesis strategies employed for various carbon-supported SACs, including vapor phase transport, high temperature pyrolysis,and wet chemical methods. Subsequently, the advanced characterization techniques for carbon-supported SACs are reviewed. The applications of carbon-supported SACs in diverse fields, such as oxygen reduction reaction, carbon dioxide reduction reaction, nitrogen reduction reaction, hydrogen evolution reaction, and oxygen evolution reaction are summarized. Special emphasis is given to the modification strategies enabling carbon-supported SACs to exhibit excellent electrocatalytic performance. Finally, the prospects and challenges associated with utilizing carbon-supported SACs for electrochemical reactions are discussed.

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合成孔径激光雷达成像技术研究进展

光电工程 2024年第3期51卷 29-49页

作者：徐晨晋凯魏凯自适应光学全国重点实验室四川成都610209 中国科学院光电技术研究所四川成都610209 浙江大学光电科学与工程学院浙江杭州310058 极端光学技术与仪器全国重点实验室浙江杭州310058

合成孔径激光雷达成像技术是一种能够突破光学系统衍射极限的主动光学成像技术,其概念来自工作在微波波段的合成孔径雷达,相比于合成孔径雷达,合成孔径激光雷达具有成像速度快、成像分辨率高以及能获取符合人眼感知的图像的优势,在远距... 详细信息

合成孔径激光雷达成像技术是一种能够突破光学系统衍射极限的主动光学成像技术,其概念来自工作在微波波段的合成孔径雷达,相比于合成孔径雷达,合成孔径激光雷达具有成像速度快、成像分辨率高以及能获取符合人眼感知的图像的优势,在远距离目标感知与识别中具有很高的潜在价值。本文从合成孔径激光雷达的工作原理出发,回顾和梳理了合成孔径激光雷达的主要关键技术的主要进展,包括合成孔径激光雷达的系统模型和基础理论、系统设计与架构、激光相位噪声抑制、运动补偿技术以及成像算法;同时对国内外重要的外场实验进展进行了总结。最后探讨了后续实现工程化所需面对的困难和挑战。

关键词：主动光学成像技术合成孔径激光雷达相干激光雷达计算成像