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Effects of crystal structure on the activity of MnO2 nanorods oxidase mimics

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Nano Research 2020年第3期13卷 709-718页

作者： Yanxia Meng kunfeng Zhao Zhaokun Zhang Peng Gao Jing Yuan Ting Cai Qin Tong Gang Huang Dannong He School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology516 Jungong RoadShanghai200093China School of Materials Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai200240China National Engineering Research Center for Nanotechnology 28 East Jiangchuan RoadShanghai200241China Shanghai University of Medicine and Health Sciences 279 Zhouzhu RoadShanghai201318China Ningbo Fundenergy Co. Ltd.699 Haicheng RoadNingbo315200China

The crystal structures would directly affect the physical and chemical properties of the surface of the material,and would thus influence the catalytic activity of the material.α-MnO2,β-MnO2 andγ-MnO2 nanorods with the same morphology yet different crystal structures were prepared and tested as oxidase mimics using 3,3’,5,5’-tetramethylbenzidine(TMB)as the substrate.β-MnO2 that exhibited the highest activity had a catalytic constant of 83.75μmol·m^−2·s^−1,2.7 and 19.0 times of those ofα-MnO2 andγ-MnO2(30.91 and 4.41μmol·m^−2·s^−1),*** characterization results showed that there were more surface hydroxyls as well as more Mn4+on the surface of theβ-MnO2 *** surface hydroxyls were conducive to the oxidation reaction,while Mn4+was conducive to the regeneration of surface *** synergistic effect of the two factors significantly improved the activity ofβ-MnO2 oxidase ***β-MnO2,aβ-MnO2-TMB-GSH system was established to detect the content of glutathione(GSH)rapidly and sensitively by *** method had a wide detection range(0.11-45μM)and a low detection limit(0.1μM),and had been successfully applied to GSH quantification in human serum samples.

关键词： crystal phase structure MnO2 oxidase mimics surface hydroxyls 3,3’,5,5’-tetramethylbenzidine(TMB) glutathione

AgAuPd/meso-Co_3O_4: High-performance catalysts for methanol oxidation

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Chinese Journal of Catalysis 2019年第6期40卷 837-848页

作者： Jun Yang Yuxi Liu Jiguang Deng Xingtian Zhao kunfeng Zhang Zhuo Han Hongxing Dai Beijing Key Laboratory for Green Catalysis and Separation Key Laboratory of Beijing on Regional Air Pollution ControlKey Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaLaboratory of Catalysis Chemistry and NanoscienceDepartment of Chemistry and Chemical EngineeringCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

The meso-Co3O4 and AgxAuyPd/meso-Co3O4 catalysts were prepared using the KIT-6-templating and polyvinyl alcohol-protected NaBH4 reduction methods,*** techniques were used to characterize physicochemical properties of these *** performance of the samples was evaluated for methanol *** cubically crystallized Co3O4 support displayed a three-dimensionally ordered mesoporous *** supported noble metal nanoparticles(NPs)possessed a surface area of 115.125 m^2/g,with the noble NPs(average size=2.***.4.5 nm)being uniformly dispersed on the surface of *** all of the samples,0.68 wt%Ag0.75Au1.14Pd/meso-Co3O4 showed the highest catalytic activity(T50%=100℃and T90%=112℃at a space velocity of 80000 mL(g^–1 h^–1).The partial deactivation of the 0.68 wt%Ag0.75Au1.14Pd/meso-Co3O4 sample due to water vapor or carbon dioxide introduction was *** is concluded that the good catalytic performance of 0.68 wt%Ag0.75Au1.14Pd/meso-Co3O4 was associated with its highly dispersed Ag0.75Au1.14Pd alloy NPs,high adsorbed oxygen species concentration,good low-temperature reducibility,and strong interaction between Ag0.75Au1.14Pd alloy NPs and meso-Co3O4.

关键词： Volatile organic compound Mesoporous cobalt oxide Supported noble metal catalyst AgAuPd alloy nanoparticle Methanol oxidation

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海上低渗砂岩储层酸压可行性及酸液体系研究

当代化工 2024年第2期53卷 401-405,409页

作者：林科雄陈霄舒福昌任坤峰罗刚胡墨杰荆州市汉科新技术研究所湖北荆州434000 中海石油(中国)有限公司湛江分公司广东湛江524057

采用常规基质酸化作业无法对海上低渗砂岩储层实施整体改造,并且由于部分储层渗透率较低,酸液无法顺利进入地层。因此,以涠洲X低渗砂岩油藏为研究对象,开展了适合海上低渗砂岩储层的酸化压裂可行性分析研究,并优选了相应的酸液体系,评... 详细信息

采用常规基质酸化作业无法对海上低渗砂岩储层实施整体改造,并且由于部分储层渗透率较低,酸液无法顺利进入地层。因此,以涠洲X低渗砂岩油藏为研究对象,开展了适合海上低渗砂岩储层的酸化压裂可行性分析研究,并优选了相应的酸液体系,评价了酸液体系的综合性能。结果表明:目标油田储层段含有一定量的碳酸盐岩矿物,储层的脆性较好,并且储层段水平主应力差异系数在0.114~0.130之间,具备酸化压裂施工的物质基础,压裂施工可使储层形成复杂的裂缝网络。采用有机酸HCW-1、有机酸盐HCF和高温缓蚀剂HSJL-3为主要处理剂,构建了一套适合海上低渗砂岩储层酸压施工的酸液体系,该酸液体系具有较低的表面张力和腐蚀速率,同时具有较强的铁离子稳定能力和防膨能力。另外,储层段天然岩心采用酸压工作液酸蚀作用后裂缝导流能力大幅度提高,并且岩心表面完整,未出现微粒脱落的现象。研究结果认为目标海上低渗砂岩储层具备酸压施工的条件,可以采取酸压施工对其进行增产改造。

关键词：海上油田低渗砂岩储层酸压可行性分析酸液体系

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人工智能在医学影像专业教学中的应用探索

中国高等医学教育 2024年第2期 13-14页

作者：王国杰杨思怡谢丽丽李坤炜刘坤凤李绍林吴庆中山大学附属第五医院广东珠海519000 东莞市东华医院广东东莞523000 中山大学附属肿瘤医院广东广州510000

目的:探讨人工智能结合传统教学方法在医学影像专业实习教学中的应用效果。方法:选取医学影像学专业实习生18人,分为两组,每组9人,对照组接受传统教学模式,试验组接受人工智能辅助诊断系统结合传统教学模式,比较两组肺结节定位诊断水平... 详细信息

目的:探讨人工智能结合传统教学方法在医学影像专业实习教学中的应用效果。方法:选取医学影像学专业实习生18人,分为两组,每组9人,对照组接受传统教学模式,试验组接受人工智能辅助诊断系统结合传统教学模式,比较两组肺结节定位诊断水平。结果:试验组肺结节定位诊断考核成绩明显高于对照组。结论:人工智能辅助诊断系统结合传统教学模式能够显著提高影像诊断教学水平。

关键词：人工智能医学影像教学

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导弹伺服系统多物理场建模设计

舰船电子工程 2024年第1期44卷 105-110,144页

作者：赵廉锦楠段丽华张昆峰李聪中国空空导弹研究院洛阳471009

导弹伺服系统是包含机械、电气、电磁、控制等多物理场的复杂机电系统。针对传统理想线性仿真技术存在的模型颗粒度不够、仿真精度不高的问题,开展细颗粒度多物理场仿真技术研究。对伺服系统的伺服电机、电路、控制算法、传动机构进行... 详细信息

导弹伺服系统是包含机械、电气、电磁、控制等多物理场的复杂机电系统。针对传统理想线性仿真技术存在的模型颗粒度不够、仿真精度不高的问题,开展细颗粒度多物理场仿真技术研究。对伺服系统的伺服电机、电路、控制算法、传动机构进行精确物理场建模,然后采用基于VHDL-AMS的统一语言建模技术、模型降阶技术和联合仿真技术相结合,实现伺服系统集成化多物理场仿真。仿真结果和样机试验结果对比表明:模型颗粒度高,仿真精度可达到87%。通过该方法可对系统进行高精度、高保真度的虚拟验证,降低研制风险。

关键词：伺服系统多物理场模型降阶联合仿真

Stable and robust control design for a benchmark Hypersonic Aircraft model

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Stable and robust control design for a benchmark Hypersonic ...

第36届中国控制会议

作者： Bai Wenyan Chen Sen Lu kunfeng Huang Wanwei Liu Ping Beijing Aerospace Automatic Control Institute Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing Aerospace Automatic Control Institute and the National Key Laboratory of Science and Technology on Aerospace Intelligent Control

ISBN: (纸本)9781538629185

This paper studies the attitude control problem for the longitudinal motion of a hypersonic aircraft model containing28 inertial and aerodynamic uncertain parameters given by NASA Langley Research *** handle the nonlinear dynamics and uncertain parameters,ADRC for the unobservable and unmatched disturbance is ***,the properties of the closed-loop system is discussed in two aspects:stability and robustness to the *** stability of the closed-loop system is proved despite of nonlinear uncertain ***,this paper points out that the closed-loop control system is sensitive to five uncertain parameters and it also gives the stability regions of these five uncertain ***,numerical simulation exercises are made to validate the theoretical analysis.

关键词： uncertain dynamics uncertain parameters nonlinear ADRC stability robustness

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采用集中发球的凝汽器清洗系统改造与评估

能源研究与管理 2024年第2期16卷 116-121页

作者：李小民高思芳孙昆峰苏之勇朱彩霞中原工学院能源与环境学院郑州450007 河南信安工程技术有限公司郑州450000

为解决凝汽器严重结垢的问题,采用集中发球技术对其清洗系统进行了改造。改造中,胶球发送采用间歇集中发球方式,由压缩空气驱动;胶球收集采用V型活动网板漏斗式收球网,由排污泵驱动。对改造后系统进行了性能测试。结果表明,改造后胶球... 详细信息

为解决凝汽器严重结垢的问题,采用集中发球技术对其清洗系统进行了改造。改造中,胶球发送采用间歇集中发球方式,由压缩空气驱动;胶球收集采用V型活动网板漏斗式收球网,由排污泵驱动。对改造后系统进行了性能测试。结果表明,改造后胶球清洗系统的收球数为8700~9000个,收球率由改造前的55%~70%增加到96%~99%;改造后凝汽器传热系数增加21%,清洁系数增加22%,传热端差降低1.05℃,冷却水出口温度降低0.5℃,凝汽器压力降低0.36 kPa,真空度降幅为7.9%,凝汽器温度降低1.6℃,机组煤耗降低1.2 g/(kW·h)。本集中发球式胶球清洗系统提高了凝汽器传热性能及机组发电效率。

关键词：凝汽器胶球清洗传热系数清洁系数

Belt and Road Initiative: Challenges and Counter-Measures

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China Economic Transition 2018年第2期1卷 101-105页

作者： ZHANG Yansheng wang Haifeng YANG kunfeng China Center for International Economic Exchanges Academy of Macroeconomic Research National Development and Reform Commission School of Economice Renmin University of China

The Belt and Road Initiative(BRI)is a major move towards China’s expansion of opening *** China continues with this approach in the future,the concerned parties should follow the principle of achieving shared growth through discussion and collaboration in order to promote cooperation and reduce risks,and the growth will bring benefits to all parties involved in the initiative.

关键词： Road concerned parties

双碳目标下工程热力学层次研究型教学模式探索

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洛阳理工学院学报（自然科学版） 2024年第3期34卷 88-92页

作者：王慧荣梁坤峰董彬周训高凤玲汤奇雄李堃冯业河南科技大学车辆与交通工程学院河南洛阳471000

双碳背景下,我国能源结构转型为高校能源动力类的人才培养提供了机遇和挑战,“新工科”时代也亟需培养具有创新实践能力和国际竞争力的高素质复合型人才。工程热力学是研究能源科学的基础课程,对其进行教学改革及其实践路径探索对于人... 详细信息

双碳背景下,我国能源结构转型为高校能源动力类的人才培养提供了机遇和挑战,“新工科”时代也亟需培养具有创新实践能力和国际竞争力的高素质复合型人才。工程热力学是研究能源科学的基础课程,对其进行教学改革及其实践路径探索对于人才培养具有重要意义。对课程内容进行模块化分析,提出“五个层次”的研究型教学模式,在尊重学生个体差异的前提下注重培养学生的创新思维和实践创造能力,实现能力与情感双重培养目标。

关键词：研究型教学模块化知识体系创新人才五个层次