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Integrating single Ni site and PtNi alloy on two-dimensional porous carbon nanosheet for efficient catalysis in fuel cell

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Nano Research 2024年第8期17卷 6916-6921页

作者： Fangyao zhou Yaner Ruan Feng Li Lin Tian Mengzhao Zhu Wenan Tie Xiaoyan Tian Bo Wang Peigen Liu Jie Xu Xiaoping Gao Peng Li huang zhou Yuen Wu Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of ChinaHefei 230026China Shanxi Yanchang Petroleum(Group)Co.Ltd. Xian 710065China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035China

The performance of catalyst depends on the intrinsic activity of active sites and the structural characteristics of the ***,we simultaneously integrate single nickel(Ni)sites and platinum-nickel(PtNi)alloy nanoparticles(NPs)on a two-dimensional(2D)porous carbon nanosheet,demonstrating remarkable catalytic performance in the oxygen reduction reaction(ORR).The single Ni sites can activate the oxygen molecules into key oxygen-containing intermediate that is further efficiently transferred to the adjacent PtNi alloy NPs and rapidly reduced to H_(2)O,which establishes a relay catalysis between active *** porous structure on the carbon nanosheet support promotes the transfer of active intermediates between these active sites,which assists the relay catalysis by improving mass ***,the obtained catalyst demonstrates a half-wave potential of up to 0.942 V,a high mass activity of 0.54 A·mgPt^(−1),and negligible decay of activity after 30,000 cycles,which are all superior to the commercial Pt/C catalysts with comparable loading of *** theoretical calculation results reveal that the obtained catalyst with defect structure of carbon support presents enhanced relay catalytic effect of PtNi alloy NPs and single Ni sites,ultimately realizing improved catalytic *** work provides valuable inspiration for developing low platinum loading catalyst,integrating single atoms and alloy with outstanding performance in fuel cell.

关键词： two-dimensional porous carbon nanosheet Pt-based alloy single atom catalysts relay effect proton-exchange membrane fuel cells

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《齐物论》的异样佛解——以《庄子内篇注·齐物论》与《齐物论释》为例

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北京社会科学 2024年第6期 53-63页

作者：周黄琴广东石油化工学院

近人较多地从知识论角度来解析《齐物论》,从而易得出相对主义的否弃论。然晚明憨山德清与近代章太炎虽皆以佛解《齐物论》,但在异样的时代需求与教育观念下,他们不仅在文本主旨上存在着“齐‘物论’”与“‘齐物’论”的异样判定,而且... 详细信息

近人较多地从知识论角度来解析《齐物论》,从而易得出相对主义的否弃论。然晚明憨山德清与近代章太炎虽皆以佛解《齐物论》,但在异样的时代需求与教育观念下,他们不仅在文本主旨上存在着“齐‘物论’”与“‘齐物’论”的异样判定,而且在佛学的解读基点上亦存在着南宗迷悟与唯识思想的异样性。在运用“立于心旨与工夫”、训诂与唯识名相解析诸法的异样诠释方法的基础上,他们通过禅老思想与华严、般若以及西学的异样融汇解读,彰显出“世人迷真执妄”与“心之主动”的观念,建构出破执而归真宰与“不齐而齐”的异样图景。无疑,这无不与二人背后所深蕴的化解庄佛矛盾、解庄传佛、振兴佛教与用国粹激动种性,以及佛庄联手的最大化救世功能之异样解读意图有着密不可分的关系。

关键词：齐物论憨山德清章太炎迷悟唯识

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二级柔性减振系统设计及力学性能分析

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振动．测试与诊断 2024年第3期44卷 494-501,618页

作者：石先杰郭卓涛黄舟周春辉任志英中国工程物理研究院总体工程研究所绵阳621999 福州大学机械工程及自动化学院福州350116

为解决二级减振引起个别仪器振动的局部放大、使得力学环境不能满足运行要求的问题,首先,针对金属橡胶双层减振系统,充分考虑安装板的柔性刚度,建立了刚柔复合的二级减振系统模型;其次,基于目标频率对二级减振的频率响应函数进行系统的... 详细信息

为解决二级减振引起个别仪器振动的局部放大、使得力学环境不能满足运行要求的问题,首先,针对金属橡胶双层减振系统,充分考虑安装板的柔性刚度,建立了刚柔复合的二级减振系统模型;其次,基于目标频率对二级减振的频率响应函数进行系统的刚度解耦,实现了减振器刚度的求解,并应用有限元进行随机振动分析,验证了刚柔复合二级减振系统理论模型的可行性;最后,利用振动台进行了试验验证。结果表明,当二级减振系统满足工程刚度需求,其一阶固有频率低于40 Hz时,减振效率可达到70%以上,试验与仿真结果基本一致。

关键词：二级柔性减振金属橡胶减振器随机振动固有频率减振效率

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一种简易的水稻抽穗扬花期耐热性评定方法

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杂交水稻 2024年第5期39卷 34-39页

作者：黄永萍吴旗黄州邹国兴江西省农业科学院水稻研究所/水稻国家工程研究中心(南昌)

随着全球气候变化的加剧，极端高温对水稻这一关键粮食作物的生产构成重大威胁。尤其是在抽穗扬花期，高温胁迫会显著降低水稻的结实率，进而影响粮食总产量。鉴于此问题的严峻性，筛选和培育耐热水稻品种显得至关重要。本研究创新性地... 详细信息

随着全球气候变化的加剧，极端高温对水稻这一关键粮食作物的生产构成重大威胁。尤其是在抽穗扬花期，高温胁迫会显著降低水稻的结实率，进而影响粮食总产量。鉴于此问题的严峻性，筛选和培育耐热水稻品种显得至关重要。本研究创新性地利用“温汤杀雄”方法模拟高温环境，通过统计自交结实率来评定水稻的耐热性。统计分析的结果表明，温汤杀雄处理与人工气候室高温处理的自交结实率存在显著的正相关关系。因此，温汤杀雄方法在评定水稻抽穗扬花期耐热性上具有有效性和可靠性。综上，本研究提供了一种快速、经济且有效的耐热性评定方法，对耐热水稻的筛选与育种具有重要的实际应用价值。

关键词：水稻高温抽穗扬花期耐热性温汤杀雄

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Senktide blocks aberrant RTN3 interactome to retard memory decline and tau pathology in social isolated Alzheimer’s disease mice

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Protein & Cell 2024年第4期15卷 261-284页

作者： He-zhou huang Wen-Qing Ai Na Wei Ling-Shuang Zhu Zhi-Qiang Liu Chao-Wen zhou Man-Fei Deng Wen-Tao Zhang Jia-Chen Zhang Chun-Qing Yang Ya-Zhuo Hu Zhi-Tao Han Hong-Hong Zhang Jian-Jun Jia Jing Wang Fang-Fang Liu Ke Li Qi Xu Mei Yuan Hengye Man Ziyuan Guo Youming Lu Kai Shu Ling-Qiang Zhu Dan Liu Department of Pathophysiology School of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Medical Genetics School of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pathology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450002China Department of Pathology School of Basic MedicineZhengzhou UniversityZhengzhou 450002China The Second Affiliated Hospital Department of NeurologyHengyang Medical SchoolUniversity of South ChinaHengyang 421001China Beijing Key Laboratory of Aging and Geriatrics National Clinical Research Center for Geriatric DiseaseInstitute of GeriatricsChinese PLA General Hospital and Chinese PLA Medical AcademyBeijing 100853China Department of Neurosurgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Neurology Union HospitalHuazhong University of Science and TechnologyWuhan 430022China Department of Biology Boston UniversityBostonMA 02215USA Center for Stem Cell and Organoid Medicine(CuSTOM) Division of Developmental BiologyCincinnati Children’s Hospital Medical CenterCincinnatiOH 45229USA

Sporadic or late-onset Alzheimer’s disease(LOAD)accounts for more than 95%of Alzheimer’s disease(AD)cases without any family *** genome-wide association studies have identified associated risk genes and loci for LOAD,numerous studies suggest that many adverse environmental factors,such as social isolation,are associated with an increased risk of ***,the underlying mechanisms of social isolation in AD progression remain *** the current study,we found that 7 days of social isolation could trigger pattern separation impairments and presynaptic abnormalities of the mossy fibre-CA3 circuit in AD *** also revealed that social isolation disrupted histone acetylation and resulted in the downregulation of 2 dentate gyrus(DG)-enriched miRNAs,which simultaneously target reticulon 3(RTN3),an endoplasmic reticulum protein that aggregates in presynaptic regions to disturb the formation of functional mossy fibre boutons(MFBs)by recruiting multiple mitochondrial and vesicle-related ***,the aggregation of RTN3 also recruits the PP2A B subunits to suppress PP2A activity and induce tau hyperphosphorylation,which,in turn,further elevates RTN3 and forms a vicious ***,using an artificial intelligence-assisted molecular docking approach,we determined that senktide,a selective agonist of neurokinin3 receptors(NK3R),could reduce the binding of RTN3 with its ***,application of senktide in vivo effectively restored DG circuit disorders in socially isolated AD *** together,our findings not only demonstrate the epigenetic regulatory mechanism underlying mossy fibre synaptic disorders orchestrated by social isolation and tau pathology but also reveal a novel potential therapeutic strategy for AD.

关键词： Alzheimer’s disease memory impairment synaptic disorder tau pathology

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地理大数据揭示中国主要城市建成环境物质存量的空间格局

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Engineering 2024年第3期34卷 143-153页

作者： zhou huang Yi Bao Ruichang Mao Han Wang Ganmin Yin Lin Wan Houji Qi Qiaoxuan Li Hongzhao Tang Qiance Liu Linna Li Bailang Yu Qinghua Guo Yu Liu Huadong Guo Gang Liu Institute of Remote Sensing and Geographical Information Systems School of Earth and Space SciencesPeking UniversityBeijing 100871China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China SDU Life Cycle Engineering Department of Green TechnologyUniversity of Southern DenmarkOdense 5230Denmark Department of Construction Management School of Civil EngineeringTsinghua UniversityBeijing 100084China School of Computer Science China University of GeosciencesWuhan 430074China School of Geographical Sciences East China Normal UniversityShanghai 200062China Land Satellite Remote Sensing Application Center Ministry of Natural ResourcesBeijing 100048China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Department of Geography California State UniversityLong BeachCA 90840USA Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China College of Urban and Environmental Sciences Peking UniversityBeijing 100871China

The patterns of material accumulation in buildings and infrastructure accompanied by rapid urbanization offer an important,yet hitherto largely missing stock perspective for facilitating urban system engineering and informing urban resources,waste,and climate ***,our existing knowledge on the patterns of built environment stocks across and particularly within cities is limited,largely owing to the lack of sufficient high spatial resolution *** study leveraged multi-source big geodata,machine learning,and bottom-up stock accounting to characterize the built environment stocks of 50 cities in China at 500 m fine-grained *** per capita built environment stock of many cities(261 tonnes per capita on average)is close to that in western cities,despite considerable disparities across cities owing to their varying socioeconomic,geomorphology,and urban form *** is mainly owing to the construction boom and the building and infrastructure-driven economy of China in the past ***’s urban expansion tends to be more“vertical”(with high-rise buildings)than“horizontal”(with expanded road networks).It trades skylines for space,and reflects a concentration-dispersion-concentration pathway for spatialized built environment stocks development within cities in *** results shed light on future urbanization in developing cities,inform spatial planning,and support circular and low-carbon transitions in cities.

关键词： Urban system engineering Built environment stock Spatial pattern Urban sustainability Big geodata

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Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run

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Chinese Physics C 2024年第9期48卷 1-7,300页

作者： Xiaoying Lu Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Yunhua Chen Chen Cheng Zhaokan Cheng Xiangyi Cui Yingjie Fan Deqing Fang Lisheng Geng Karl Giboni Xuyuan Guo Chencheng Han Ke Han Changda He Jinrong He Di huang Junting huang zhou huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin Ju Chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li Qing Lin Jianglai Liu Congcong Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen Manbin Shen Lin Si Wenliang Sun Yi Tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Xu Wang zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Yuan Wu Mengjiao Xiao Xiang Xiao Kaizhi Xiong Binbin Yan Xiyu Yan Yong Yang Chunxu Yu Ying Yuan Zhe Yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Jifang zhou Ning zhou Xiaopeng zhou Yubo zhou Zhizhen zhou Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China New Cornerstone Science Laboratory Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China Shanghai Jiao Tong University Sichuan Research Institute Chengdu 610213China Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of Sichuan Province Liangshan 615000China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Department of Physics Yantai UniversityYantai 264005China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 102206China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics University of MarylandCollege ParkMaryland 20742USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Physics Peking UniversityBeijing 100871Ch

The proton-proton(pp)fusion chain dominates the neutrino production in the *** uncertainty of the predicted pp neutrino flux is at the sub-percent level,whereas that of the best measurement is O(10%).In this study,for the first time,we measure solar pp neutrinos in the electron recoil energy range from 24 to 144 keV using the PandaX-4T commissioning data with 0.63 tonne×year *** pp neutrino flux is determined as(8.0±3.9(stat)±10.0(syst))×1010 s^(-1)cm^(-2),which is consistent with the Standard Solar Model and existing measurements,corresponding to an upper flux limit of 23.3×10^(10)s^(-1)cm^(-2)at 90%C.L..

关键词： solar pp neutrino flux PandaX-4T electron recoil spectrum

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硫掺杂Na_(3)(VOPO_(4))_(2)F正极材料的制备及储钠性能

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无机盐工业 2024年第2期56卷 30-37页

作者：周煌胡晓萍任稳曹鑫鑫中南大学材料科学与工程学院湖南长沙410083

聚阴离子型Na_(3)(VOPO_(4))_(2)F材料具有结构稳定、安全性高及工作电压高等特性,其开放的三维框架结构可以为钠离子的快速迁移提供路径,是目前最具发展潜力的钠离子电池正极材料之一。然而,Na_(3)(VOPO_(4))_(2)F的本征电子导电性较差... 详细信息

聚阴离子型Na_(3)(VOPO_(4))_(2)F材料具有结构稳定、安全性高及工作电压高等特性,其开放的三维框架结构可以为钠离子的快速迁移提供路径,是目前最具发展潜力的钠离子电池正极材料之一。然而,Na_(3)(VOPO_(4))_(2)F的本征电子导电性较差,导致倍率性能不理想。离子掺杂是一种提升材料导电性和电化学性能的有效策略。通过水热法成功制备了S^(2-)掺杂的Na_(3)(VOPO_(4))_(2)S_(x)F材料。XRD和电化学阻抗结果表明,S^(2-)掺杂可以扩大离子扩散通道并降低电荷传输电阻;恒电流间歇滴定测试结果显示S^(2-)掺杂可以加快离子迁移速率。因此,Na_(3)(VOPO_(4))_(2)S_(x)F正极材料在钠离子半电池中表现出优异的电化学性能,在30C倍率下可逆比容量为66.8mA·h/g,在10C倍率下循环500次后容量保持率可达96%。Na_(3)(VOPO_(4))_(2)S_(x)F正极与硬碳负极组成的钠离子全电池可获得121.7mA·h/g的高比容量,在1C倍率下循环60次后,其容量衰减可以忽略不计。

关键词：氟磷酸钒氧钠离子掺杂正极材料钠离子电池

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城市居住街区的适宜规模尺度探讨——从居住小区到居住街区的转变

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城市建筑 2024年第9期21卷 140-144页

作者：李先勇黄舟北京市建筑设计研究院股份有限公司

文章针对国内的具体现状,比较全面地对居住街区的合理规模进行了分析,分别从城市路网的规划、配套设施的服务半径、邻里空间的建立、城市活力和经济的发展、公共权益的维护等角度分析了居住街区规模尺度的上限,从空间层次的创造、配套... 详细信息

文章针对国内的具体现状,比较全面地对居住街区的合理规模进行了分析,分别从城市路网的规划、配套设施的服务半径、邻里空间的建立、城市活力和经济的发展、公共权益的维护等角度分析了居住街区规模尺度的上限,从空间层次的创造、配套设施的规模效益、配套设施的分级设置等角度分析了居住街区规模尺度的下限,认为居住街区规模用地范围为4~6.25 hm^(2),户数控制在1000~2000户,人数控制在3000~5000人比较合适。

关键词：居住街区规模邻里空间公共权益

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民航中小机场运行风险管控措施效能评估研究

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航空计算技术 2024年第5期54卷 1-5,10页

作者：唐卫贞黄婷黄洲升中国民用航空飞行学院四川广汉618000

机场作为关键的交通枢纽和经济引擎,必须实施安全风险管理,以确保其安全运营,为此,提出了危险源管控措施效能评估模型。采集多个机场的危险源数据,对其进行量化分析;利用GloVe将管控措施文本处理成词向量,通过文本卷积神经网络(TextCNN... 详细信息

机场作为关键的交通枢纽和经济引擎,必须实施安全风险管理,以确保其安全运营,为此,提出了危险源管控措施效能评估模型。采集多个机场的危险源数据,对其进行量化分析;利用GloVe将管控措施文本处理成词向量,通过文本卷积神经网络(TextCNN)模型,评估出风险管控措施的效果。通过对比实验,确定危险源管控措施效能评估模型的优劣。结果表明基于TextCNN的效能评估模型的准确率达到74.36%,而基于TextRNN的模型为69.24%。因此,TextCNN更适合用于此类评估任务。本研究为机场管理部门提供了一个新的视角和方法,以更有效地评估和管理各种危险源,从而提升整个机场的安全性能。

关键词：机场风险管控卷积神经网络危险源效能评估自然语言处理效能评估

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