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Strong metal-support interactions between highly dispersed Cu^(+) species and ceria via mix-MOF pyrolysis toward promoted water-gas shift reaction

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Journal of Energy Chemistry 2024年第4期91卷 475-483页

作者： xiao-Chen Sun Xing-chi Li Ze-Wei Xie Chen-Yue Yuan De-Jiu Wang Qian Zhang xiao-Yu Guo Hao Dong Hai-Chao Liu Ya-Wen Zhang Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Stable and Unstable SpeciesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The modulation of metal-support interfacial interaction is significant but challenging in the design of high-efficiency and high-stability supported ***,we report a synthetic strategy to upgrade Cu-CeO_(2)interfacial interaction by the pyrolysis of mixed metal-organic framework(MOF)*** obtained highly dispersed Cu/CeO_(2)-MOF catalyst via this strategy was used to catalyze water-gas shift reaction(WGSR),which exhibited high activity of 40.5μmolCOgcat^(-1).s^(-1)at 300℃and high stability of about 120 *** on comprehensive studies of electronic structure,pyrolysis strategy has significant effect on enhancing metal-support interaction and then stabilizing interfacial Cu^(+)species under reaction *** Cu^(+)species and generated oxygen vacancies over Cu/CeO_(2)-MOF catalyst played a key role in CO molecule activation and H2O molecule dissociation,*** collaborated closely and then promoted WGSR catalytic performance in comparison with traditio nal supported *** study shall offer a robust approach to harvest highly dispersed catalysts with finely-tuned metal-support interactions for stabilizing the most interfacial active metal species in diverse heterogeneous catalytic reactions.

关键词： Cu-based catalyst MOF derivative Water-gas shift reaction Metal-support interaction

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Capsaicin alleviates the hepatic clock gene disruption and gut microbiota dysbiosis in circadian rhythm disorder mouse model

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Food Science and Human Wellness 2024年第5期13卷 2947-2958页

作者： Bolin Lin chi-Tang Ho Yawen Wang Jie xiao Muwen Lu Guangdong Provincial Key Laboratory of Nutraceuticals and Functional Foods College of Food ScienceSouth China Agricultural UniversityGuangzhou 510642China Department of Food Science Rutgers UniversityNew Brunswick 08901USA Department of Hematology The Hospital Affiliated to Qingdao UniversityQingdao 266000China

As the body’s internal clock,the circadian rhythm regulates the energy expenditure,appetite,and *** exists a close relationship between the host circadian rhythm and gut *** this work,a circadian disorder mouse model induced by constant darkness(CD)was constructed to investigate the regulating effects of capsaicin(CAP)on disturbances of metabolism homeostasis and gut microbiota in the respect of circadian rhythm-related *** results indicated that CAP reduced weight gain induced by circadian rhythm disorder in mice by inhibiting fat accumulation in liver and adipose *** rhythmic expressions of circadian clock genes and lipid-metabolism related genes in liver were also recovered by *** study using 16S rRNA sequencing revealed that CAP modulated the gut microbiota richness,diversity and composition,and restored diurnal oscillations of gut microbes at the phylum and family *** results indicated that CAP could alleviate CD-induced hepatic clock gene disruption and gut microbiota dysbiosis in mice,providing theoretical basis for CAP to be used as a muti-functional ingredient with great healthpromoting effects.

关键词： Capsaicin Circadian rhythm Hepatic clock gene Gut microbiota Lipid dysregulation

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论陶渊明藉田园开创的诗歌新美典

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中华文史论丛 2010年第1期 115-167页

作者：蕭馳新加坡国立大学中文系

本文强调陶渊明对中国诗歌的贡献在创造出足以辉耀整个传统的新美典。文章提出陶氏的社会理想接近“秦汉之际新儒家”，故其对力田和个体生命的态度与孔孟扦格。而陶诗美感的源泉，则在与此生命态度相关的“委运”和“乘化”。本文第二... 详细信息

本文强调陶渊明对中国诗歌的贡献在创造出足以辉耀整个传统的新美典。文章提出陶氏的社会理想接近“秦汉之际新儒家”，故其对力田和个体生命的态度与孔孟扦格。而陶诗美感的源泉，则在与此生命态度相关的“委运”和“乘化”。本文第二、三节转入对陶诗田园世界和抒情自我的讨论，并以三端概括陶诗新美典：首先，“乘化”的生命态度令诗人自时间面去体悟四季、晨昏的循环，天人一体、身心一体地感知熟稔的土地。由此生出的不设色的田园世界，与诗坛逐渐声色大开的局面形成对照。其次，陶诗解构了屈原开创的抒情自我原型，首次将诗人自我形象白描在日常生活化背景之上。最後，陶诗以彻底的内在主义，为中国诗歌由嵇康开始的对超越境界的追求找到了归宿。

关键词：陶渊明秦汉之际新儒家乘化田园世界抒情自我

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基于分块的压缩重建方法

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西北师范大学学报（自然科学版） 2016年第6期52卷 51-55页

作者：肖驰田小霞韩山师范学院计算机和信息工程学院广东潮州521041 汕头大学工学院广东汕头515063

图像的压缩重建是当前图像处理中的研究热点,本文提出了一种基于分块压缩的重建方法,该方法首先将图像分成尺寸相同的图像块,在一定的压缩比下各块独自完成SL0重建,最后将各图像块的重建结果拼接成整幅图像.图像块的尺寸与整幅图像的重... 详细信息

图像的压缩重建是当前图像处理中的研究热点,本文提出了一种基于分块压缩的重建方法,该方法首先将图像分成尺寸相同的图像块,在一定的压缩比下各块独自完成SL0重建,最后将各图像块的重建结果拼接成整幅图像.图像块的尺寸与整幅图像的重建时间和质量有密切关系.块尺寸大,重建时间长;块尺寸小,块效应影响图像质量.文中对由尺寸较小图像块组成的重建图像进行维纳滤波,消弱了块效应并提高了图像视觉效果.仿真实验结果显示该方法具有重建时间短和压缩质量高的优势.

关键词： SL0压缩块压缩维纳滤波

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Excess Activity Tuned by Distorted Tetrahedron in CoMoO_(4) for Oxygen Evolution

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Energy & Environmental Materials 2024年第1期7卷 247-252页

作者： Hengbo xiao Kai chi Hongxia Yin Xiangji Zhou Pengxiang Lei Peizhi Liu Jiakun Fang Xiuhong Li Songliu Yuan Zhen Zhang Yaqiong Su Junjie Guo Lihua Qian School of Physics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Hubei University of TechnologyWuhan 430068China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry Xi'an Jiaotong UniversityXi'an 710049China

Oxygen vacancies enable modulating surface reconstruction of transition metal oxides containing metal-oxygen polyhedrons into metallic oxyhydroxide for oxygen evolution reaction(OER),while revealing reconstructing mechanism is stuck by the requirement to precisely control exact sites of these ***,oxygen vacancies are localized only within MoO_(4)tetrahedrons rather than CoO_(6)octahedrons in CoMoO_(4)catalyst,guaranteeing coherent reconstruction of CoO_(6)octahedrons into pure CoOOH with tunable activities for ***,distorted tetrahedron accelerates the dissolution of Mo atoms into alkaline electrolyte,triggering spontaneous transition of partial CoMoO_(4)into Co(OH)_(2).CoO_(6)octahedrons in both CoMoO_(4)and Co(OH)_(2)can transform pure CoOOH completely at lower potential,resulting in excess intrinsic activity whose summit is identified by overpotential at 10 mA cm^(-2)with 22.9%reduction and Tafel slope with 65.3%***-defined manipulation over the distorted polyhedrons offers one versatile knob to precisely modulate electronic structure of oxide catalysts with outstanding OER performance.

关键词： metal-oxygen polyhedron oxygen evolution reaction oxygen vacancy Raman spectroscopy

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Knowledge Distillation via Hierarchical Matching for Small Object Detection

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Journal of Computer Science & Technology 2024年第4期39卷 798-810页

作者： Yong-chi Ma xiao Ma Tian-Ran Hao Li-Sha Cui Shao-Hui Jin Pei Lyu School of Computer Science and Artificial Intelligence Zhengzhou UniversityZhengzhou 450000China

Knowledge distillation is often used for model compression and has achieved a great breakthrough in image classification,but there still remains scope for improvement in object detection,especially for knowledge extraction of small *** main problem is the features of small objects are often polluted by background noise and not prominent due to down-sampling of convolutional neural network(CNN),resulting in the insufficient refinement of small object features during *** this paper,we propose Hierarchical Matching Knowledge Distillation Network(HMKD)that operates on the pyramid level P2 to pyramid level P4 of the feature pyramid network(FPN),aiming to intervene on small object features before *** employ an encoder-decoder network to encapsulate low-resolution,highly semantic information,akin to eliciting insights from profound strata within a teacher network,and then match the encapsulated information with high-resolution feature values of small objects from shallow layers as the *** this period,we use an attention mechanism to measure the relevance of the inquiry to the feature *** in the process of decoding,knowledge is distilled to the *** addition,we introduce a supplementary distillation module to mitigate the effects of background *** show that our method achieves excellent improvements for both one-stage and twostage object ***,applying the proposed method on Faster R-CNN achieves 41.7%mAP on COCO2017(ResNet50 as the backbone),which is 3.8%higher than that of the baseline.

关键词： knowledge distillation object detection small object detection machine learning

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聚丙烯中电树枝生长机理研究

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物理学报 2014年第17期63卷 298-305页

作者：迟晓红高俊国郑杰张晓虹哈尔滨理工大学电气与电子工程学院工程电介质及其应用教育部重点实验室哈尔滨150080

耐电树枝老化特性是表征聚合物绝缘材料介电性能的重要参数之一.聚丙烯(PP)是典型半结晶聚合物,其复杂的非均匀聚集态结构影响电树枝的生长.本文对PP及加入成核剂的PP试样进行了耐电树枝化性能实验,通过偏光显微镜(PLM)及差示扫描量热法... 详细信息

耐电树枝老化特性是表征聚合物绝缘材料介电性能的重要参数之一.聚丙烯(PP)是典型半结晶聚合物,其复杂的非均匀聚集态结构影响电树枝的生长.本文对PP及加入成核剂的PP试样进行了耐电树枝化性能实验,通过偏光显微镜(PLM)及差示扫描量热法(DSC)分析加入成核剂前后PP的结晶形态、结晶度以及结晶结构对电树枝生长特征的影响.以相界面自由能的热驱动作用以及放电雪崩理论为基础,对电树枝生长的热力学和动力学机理进行分析,阐明电场分布对电树枝生长的重要作用.根据半结晶材料的结晶相和非晶相的物理性能,建立材料内部电场分布计算模型,模拟针-板电极条件下聚合物材料内部的局域电场分布情况,分析了电树枝通道的动力学生长特征,探讨了成核剂改变PP的结晶结构抑制电树枝沿电场生长的作用.

关键词：电树枝聚丙烯(PP) 热力学动力学

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童话空间中的“子宫”意象研究

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海南大学学报（人文社会科学版） 2016年第1期34卷 70-76页

作者：严晓驰北京师范大学文学院北京100875 浙江农林大学文化学院浙江临安311300

子宫是童话空间的经典意象,其在童话文本中主要表现为"吞食"这一主题,当中包含着关于"进"与"出"的哲学思考。进入子宫到离开子宫的过程象征着人格上的考验,童话主人公借此完善了自我人格;同时,这一过程势必会带来如婴孩离开母体时的分... 详细信息

子宫是童话空间的经典意象,其在童话文本中主要表现为"吞食"这一主题,当中包含着关于"进"与"出"的哲学思考。进入子宫到离开子宫的过程象征着人格上的考验,童话主人公借此完善了自我人格;同时,这一过程势必会带来如婴孩离开母体时的分离焦虑,这种焦虑在多数情况下会借助主人公的贪食或被食表现出来;在完善了自我人格并去除了早期的分离焦虑后,主人公们也顺势实现了性格重塑,最终获得新生。

关键词：子宫身体吞食焦虑重生

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Unusual ent-atisane type diterpenoids with 2-oxopropyl skeleton from the roots of Euphorbia ebracteolata

Unusual ent-atisane type diterpenoids with 2-oxopropyl skele...

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中国化学会第十二届全国天然有机化学学术会议

作者： Qing-Song Yan Da-Wei Li Chao Wang xiao-chi Ma College of Pharmacy Department of Pharmacythe First Affiliated HospitalAcademy of Integrative MedicineDalian Medical University

The dried roots of Euphorbia ebracteolata Hayata(Euphorbiaceae),named "Lang Du" in china,are particularly important traditional chinese medicines used for the treatments of edema,cough,indigestion,asthma,and chronic bronchitis .*** is widely distributed in the chinese provinces of Anhui,Jiangsu,Zhejiang,and Fujian .It was reported that there were various diterpenoids existed in the roots of Euphorbia ebracteolata,which also displayed widely biological *** a part of our project to searching for new bioactive compounds from Euphorbia *** new(1 and 2) and four known(3-6) ent-atisane diterpenoids(Fig.1) were isolated from the roots of Euphorbia *** structures and absolute configurations of these compounds were determined by extensive spectroscopic data analysis,including 2 D NMR,single-crystal X-ray crystallography,13 C NMR calculation,and electronic circular dichroism spectra *** structures were determined as ebractenone A(1),ebractenone B(2),ent-13(R)-hydroxy-3,14-dioxo-16-atisene(3) ,ent-atis-16-ene-3,14-dione(4) ,ent-(3β,13 S)-3,13-dihydroxy atis-16-en-14-one(5) ,and ent-(13 S)-13-hydroxyatis-16-ene-3,14-dione(6) .Compounds 1 and 2 represent the first natural products possessing the ent-atisane type diterpenoids with 2-oxopropyl skeleton.

关键词： Euphorbia ebracteolata Diterpenoids Atisane

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ent-Abietane-type diterpenoids from the roots of Euphorbia ebracteolata

ent-Abietane-type diterpenoids from the roots of Euphorbia e...

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中国化学会第十二届全国天然有机化学学术会议

作者： Yi-Fei Wang Da-Wei Li xiao-chi Ma Chao Wang College of Pharmacy Department of Pharmacythe First Affiliated HospitalAcademy of Integrative MedicineDalian Medical University

Euphorbia ebracteolata Hayata(Euphorbiaceae) is a biennial herbaceous plant that is widely distributed and cultivated in *** dried roots,named "Lang Du" in chinese,are used in traditional chinese medicine for the treatments of edema,cough,indigestion,asthma,and chronic *** studies of the roots of *** revealed that these roots contain diterpenoids,triterpenoids,sesquiterpenoids,flavonols,and acetophenones,*** which diterpenoids are the main active constituents .As part of a program to assess the chemical and biological diversity of traditional chinese medicines,the ethanol extract of the roots of *** has been *** new ent-abietane-type diterpenoids(1-3),together with ten known analogues(4-13) were obtained from the roots of Euphorbia *** structures of these compounds were determined by extensive spectroscopic data analysis,including UV,HRESIMS,1 D-,2 D-NMR *** structures were determined as Euphoroids A(1),Euphoroids B(2),Euphoroids C(3),Jolkinolide E(4),ent-11α-hydroxyabicta-8(14),13(15)-dien-16,12-olide(5),Jolkinolide F(6),Helioscopinolide E(7),Jolkinolide B(8),Jolkinolide A(9),Euphopilolide(10),Fischeriolide A(11),Yuexiandajisu D(12),Yuexiandajisu E(13).

关键词： Euphorbia ebracteolata Diterpenoids ent-Abietane

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