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Anti-aging performance improvement and enhanced combustion efficiency of boron via the coating of PDA

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Defence Technology（防务技术） 2024年第3期33卷 399-410页

作者： Shuai Ma Qinghai Shu Mengyang Zhang hongyu huang Yansong Shi Xijuan Lv Shuai Zhao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing100081China Tangshan Research Institute of Beijing Institute of Technology Tangshan063000HebeiChina

Boron is an ambitious fuel in energetic materials since its high heat release values,but its application is prohibited by low combustion efficiency and oxidization during *** polydopamine(PDA)was introduced into boron particles,investigating the impact of PDA content on the energetic behavior of *** results indicated that the PDA coating formed a fishing net structure on the surface of boron *** heat release results showed that the combustion calorific value of B@PDA was higher than that of the raw ***,the actual combustion heat of boron powder in B@10%PDA increased by 38.08%.Meanwhile,the DSC peak temperature decreased by 100.65℃under similar oxidation rate compared to raw ***,the B@PDA@AP and B@AP composites were prepared,and their combustion properties were *** was demonstrated that B@10%PDA@AP exhibited superior performance in terms of peak pressure and burning time,*** peak pressure is 12.43 kPa more than B@AP and burning time is 2.22 times higher than B@***,the coating of PDA effectively inhibits the oxidization of boron during storage and enhances the energetic behavior of boron and corresponding composites.

关键词： Boron particles Polydopamine Anti-aging performance improvement Heat release

Unraveling the atomic interdiffusion mechanism of NiFe_(2_)O_(4)oxygen carriers during chemical looping CO_(2)conversion

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Carbon Energy 2024年第8期6卷 105-121页

作者： Da Song Yan Lin Shiwen Fang Yang Li Kun Zhao Xinfei Chen Zhen huang Fang He Zengli Zhao hongyu huang Fanxing Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhouChina School of Energy Science and Engineering University of Science and Technology of ChinaHefeiChina College of Mechanical and Electrical Engineering Zhongkai University of Agriculture and EngineeringGuangzhouChina College of Chemistry and Bioengineering Guilin University of TechnologyGuilinChina North Carolina State University RaleighNorth CarolinaUSA

By employing metal oxides as oxygen carriers,chemical looping demonstrates its effectiveness in transferring oxygen between reduction and oxidation environments to partially oxidize fuels into syngas and convert CO_(2)into ***,NiFe_(2_)O_(4)oxygen carriers have demonstrated remarkable efficiency in chemical looping CO_(2)***,the intricate process of atomic migration and evolution within the internal structure of bimetallic oxygen carriers during continuous high‐temperature redox cycling remains ***,the lack of a fundamental understanding of the complex ionic migration and oxygen transfer associated with energy conversion processes hampers the design of high‐performance oxygen ***,in this study,we employed in situ characterization techniques and theoretical calculations to investigate the ion migration behavior and structural evolution in the bulk of NiFe_(2_)O_(4)oxygen carriers during H2 reduction and CO_(2)/lab air oxidation *** discovered that during the H2 reduction step,lattice oxygen rapidly migrates to vacancy layers to replenish consumed active oxygen species,while Ni leaches from the material and migrates to the *** the CO_(2)splitting step,Ni migrates toward the core of the bimetallic oxygen carrier,forming Fe–Ni *** the air oxidation step,Fe–Ni migrates outward,creating a hollow structure owing to the Kirkendall effect triggered by the swift transfer of lattice *** metal atom migration paths depend on the oxygen transfer *** discoveries highlight the significance of regulating the release–recovery rate of lattice oxygen to uphold the structures and reactivity of oxygen *** work offers a comprehensive understanding of the oxidation/reduction‐driven atomic interdiffusion behavior of bimetallic oxygen carriers.

关键词： chemical looping CO_(2)splitting density functional theory in situ characterization ionic migration

辅助生殖技术中异位妊娠风险的相关性因素研究

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实用妇科内分泌电子杂志 2024年第13期11卷 27-29页

作者：黄洪玉昆明医科大学第一附属医院生殖遗传科超声室云南昆明650032

在体外受精-胚胎移植(IVF-ET)技术的快速发展过程中,异位妊娠(EP)的发生率也在逐渐上升。由于辅助生殖技术(ART)过程中发生EP的具体原因与机理目前尚不清楚,大多数认为发生EP的危险因素为输卵管功能异常、ART的操作及体内激素水平异常... 详细信息

在体外受精-胚胎移植(IVF-ET)技术的快速发展过程中,异位妊娠(EP)的发生率也在逐渐上升。由于辅助生殖技术(ART)过程中发生EP的具体原因与机理目前尚不清楚,大多数认为发生EP的危险因素为输卵管功能异常、ART的操作及体内激素水平异常等。本文对IVF-ET助孕中与EP发生相关的因子作一综述。

关键词：辅助生殖技术异位妊娠风险因素

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一种基于粗网格的多算子模拟成像方法

石油地球物理勘探 2024年第5期59卷 1012-1021页

作者：宋坤孙成禹刘童蔡瑞乾黄宏宇中国石油大学(华东)地球科学与技术学院山东青岛266580

对于已知速度模型,传统的叠前深度偏移成像方法都是以快速获得高精度偏移剖面为目的。基于成像算子的模拟叠前深度偏移成像方法无需进行波场正演和偏移处理便可快速得到偏移结果,但成像算子却是根据单一散射点散射向量构建的,只能对散... 详细信息

对于已知速度模型,传统的叠前深度偏移成像方法都是以快速获得高精度偏移剖面为目的。基于成像算子的模拟叠前深度偏移成像方法无需进行波场正演和偏移处理便可快速得到偏移结果,但成像算子却是根据单一散射点散射向量构建的,只能对散射点附近的局部区域进行精准模拟成像。为了提高直接模拟成像结果的可靠性和兼顾直接模拟成像计算效率高的优势,先在粗网格离散原速度模型的前提下建立粗点扩散算子,在波数域对粗点扩散算子进行不同插值方法测试,测试不同尺寸粗网格以及不同插值方法对模拟成像结果的影响。在此基础上,又提出一种多算子协同模拟成像,设置多个局部偏移成像窗,每个窗内布置散射点并求取射线路径,分区构建较为精准的控制局部成像的成像算子,使模拟成像结果能更好地体现观测系统对不同区域的理论成像结果的影响。该方法不仅保留了快速成像的高计算效率,同时得到控制局部成像的成像算子,可以模拟不同区域在同一观测系统的理论模拟成像结果,并检测观测系统对全局成像的影响,可以直接展示观测系统对不同区域理论成像的控制。

关键词：直接模拟成像粗网格插值点扩散算子多算子协同局部偏移成像窗

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污泥热解气/氨旋流火焰燃烧特性

新能源进展 2024年第1期12卷 15-23页

作者：吴宁陈达南郭怡君李军黄宏宇广州环保投资集团有限公司广东省垃圾焚烧技术与装备工程实验室广州510015 中国科学院广州能源研究所广州510640 中国科学技术大学能源科学与技术学院广州510640 江西省碳中和研究中心南昌330096

污泥热解气因难以被有效利用导致了大量的能源浪费,而其中所含的氢气、甲烷等可燃组分可有效提升氨燃料的燃烧性能。对污泥热解气掺氨旋流火焰的结构及燃烧特性进行分析,基于化学发光法,通过实验考察当量比、掺氨比对火焰结构的影响。... 详细信息

污泥热解气因难以被有效利用导致了大量的能源浪费,而其中所含的氢气、甲烷等可燃组分可有效提升氨燃料的燃烧性能。对污泥热解气掺氨旋流火焰的结构及燃烧特性进行分析,基于化学发光法,通过实验考察当量比、掺氨比对火焰结构的影响。结果表明,旋流燃烧火焰中的OH*在化学当量条件(φ=1.0)下辐射强度最大,CH*在富燃条件(φ=1.2)下辐射强度最大,OH*可以对火焰稳定性进行更好地表征;污泥热解气/氨气混合燃料中,随着氨气比例增大,旋流火焰稳定性下降。

关键词：热解气氨气化学发光旋流火焰稳定性污染物控制

纳米多孔碳孔径对SrBr_(2)化学蓄放热性能的影响

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新能源进展 2024年第3期12卷 269-275页

作者：吴佳涛曾涛李军邓立生黄宏宇中国科学技术大学能源科学与技术学院广州510640 中国科学院广州能源研究所广州510640

溴化锶(SrBr_(2))被认为是化学蓄热领域最有前景的材料之一。为探究载体孔径大小对SrBr_(2)蓄放热性能的影响,分别以孔径为10、30、50和100 nm的纳米多孔碳(NCP)为载体,采用浸渍法制备多孔碳基SrBr_(2)复合材料。通过XRD、SEM和BET对复... 详细信息

溴化锶(SrBr_(2))被认为是化学蓄热领域最有前景的材料之一。为探究载体孔径大小对SrBr_(2)蓄放热性能的影响,分别以孔径为10、30、50和100 nm的纳米多孔碳(NCP)为载体,采用浸渍法制备多孔碳基SrBr_(2)复合材料。通过XRD、SEM和BET对复合材料的微观形貌结构进行表征,并通过水合实验和同步热分析对其蓄放热性能进行测试。结果表明,复合材料的吸水量和蓄热密度随孔径先增大后减小,存在最优载体孔径。其中,NCP50-SrBr_(2)具有最优的平衡吸水量和蓄热密度,分别为0.703 g/g和1198.62 kJ/kg。NCP50-SrBr_(2)表现出更快的反应速率,在水合反应30min后蓄热密度可达945.34kJ/kg。研究结果可为纳米尺度定向调控化学蓄热材料性能提供理论依据。

关键词：化学蓄热孔径溴化锶纳米多孔碳蓄放热性能

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电商平台剥削性价格模式的反垄断法规范研究

中国物价 2024年第3期 18-22页

作者：黄宏宇张春燕外交学院国际法系

在电商平台市场,反垄断法以规范竞争秩序为手段促进平台经济健康有序发展。然而,基于资本优势和对资本扩张的需求,电商平台逐渐走向垄断,剥削性价格是平台资本增长的重要方式,以削弱竞争秩序为基础剥削平台用户福利,同时冲击电商平台市... 详细信息

在电商平台市场,反垄断法以规范竞争秩序为手段促进平台经济健康有序发展。然而,基于资本优势和对资本扩张的需求,电商平台逐渐走向垄断,剥削性价格是平台资本增长的重要方式,以削弱竞争秩序为基础剥削平台用户福利,同时冲击电商平台市场利益公平分配秩序。对此,应明确相关问题的垄断违法性证成逻辑,关注经营者个体利益与平台用户利益的公平分配问题,并合理适用违法推定规则。此外,反垄断事后监管的消极性难以应对平台基于算法技术的高速演变性,对电商平台剥削性价格行为应采用以促进分配正义为导向、以规范引导价格行为为理念的事中监管模式。

关键词：电商平台剥削性价格消费者福利公平分配事中监管

Fabrication of LiOH-metal organic framework derived hierarchical porous host carbon matrix composites for seasonal thermochemical energy storage

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Nano Research 2022年第9期15卷 8028-8038页

作者： Xiangyu Yang Shijie Li Jianguo Zhao hongyu huang Lisheng Deng School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009China Key Laboratory of Renewable Energy Guangdong Provincial Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangdong Intelligent Filling Technology Limited Company Foshan 528137China

By virtue of its long lifespan and outstanding storage intensity with near-zero heat loss,salt hydrate thermochemical energy storage(TES)materials provide a feasible option for the effective use of renewable energy and overcoming its unsynchronized supply and ***,an activated porous carbon originating from the zeolite imidazolate framework(ZHCM)is fabricated and served as the carbon matrix for the LiOH TES *** as-synthesized Li/ZHCM2-40 not only has excellent storage intensity(maximum 2414.2 kJ·kg^(−1))with low charging temperature,but also shows great hydration properties stemming from the ultrahigh surface area and hierarchical porous structure of ***,this composite material exhibits superior thermal conductivity,while its storage intensity is only attenuated by 10.2%after 15 times of consecutive charge-discharge process,revealing its outstanding cycle *** the numerical simulation results also demonstrate its superior heat transfer *** developed LiOH TES composite may afford a new avenue for efficient low-grade thermochemical energy storage and liberate the possibility of further exploration of metal organic frameworks derived porous carbon matrix in the future.

关键词： LiOH TES composite ZIF-8 derived porous carbon low-grade thermochemical energy storage cycle stability

Development of covalent-organic frameworks derived hierarchical porous hollow carbon spheres based LiOH composites for thermochemical heat storage

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Journal of Energy Chemistry 2022年第10期31卷 301-310,I0007页

作者： Xiangyu Yang Shijie Li Jianguo Zhao hongyu huang Lisheng Deng Institute of Carbon Materials Science Shanxi Datong UniversityDatong 037009ShanxiChina School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Key Laboratory of Renewable Energy Guangdong Provincial Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640GuangdongChina Guangdong Intelligent Filling Technology Limited Company Foshan 528137GuangdongChina

Under the joint assistance of its excellent storage strength, accessible long storage lifespan, and high heat utilization efficiency, salt hydrate-based thermochemical heat storage(THS) materials give renewable energy an important outlet to alleviate the pressure of underutilization. Herein, an activated hollow spherical carbon(AHSC) with hierarchical porous architectures converted from covalent-organic frameworks(COFs) is constructed and utilized as the supporting matrix for Li *** composite material for the first time. The obtained Li/AHSC_(3) composites have distinguished hydration performance while manifesting impressive storage ability up to 1916.4 k J kg^(-1)with low operating temperature stemming from the collective effect of the void spherical framework, multimodal porosity, and high surface area of AHSC3. And the Li/AHSC3-40 composite with evidently progressed thermal conductivity is capable of realizing 94.5% heat preservation after twenty-five adsorption-desorption cycles, exhibiting its eminent cyclability and great heat transfer performance. This study not only brings new hope for overcoming the underutilization of low-grade heat but also may enlighten new ideas for enriching the application scenarios of COFs-derived carbonaceous materials.

关键词： Activated hollow spherical carbon Hierarchical porous architectures LiOH·THS composite material Storage ability COFs-derived carbonaceous materials