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Single-atom Ni-N_(4..for enhanced electrochemical sensing

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Nano Research 2024年第8期17卷 7658-7664页

作者： Zhuhui Qin Bo Tang Guiru zhang Chongqing Zhu Kun jiang Bowei zhang Fu-Zhen Xuan Shanghai Key Laboratory of Intelligent Sensing and Detection Technology East China University of Science and TechnologyShanghai 200237China Key Laboratory of Pressure systems and Safety of Ministry of Education East China University of Science and TechnologyShanghai 200237China school of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China Interdisciplinary Research Center School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Single-atom catalysts(SACs)attract widespread attention in heterogeneous catalysis due to their maximum atomic utilization efficiency and unique physical and chemical ***,their applications in chemical sensing keep huge potential but remain ***,a Ni-N_(4..C SAC was synthesized for the trace detection of dopamine(DA)and uric acid(UA).The Ni-N_(4..C SAC exhibited superior sensing performance compared to the Ni *** detection range for DA and UA were 0.05–75μM and 5–90μM with detection limits of 0.027 and 0.82μM,*** functional theory(DFT)computations indicate that Ni-N_(4..C has a lower reaction barrier during electrochemical process,indicating that the atomic Ni sites possess higher intrinsic activity than Ni ***,DA and UA show strong potential dependency on the Ni-N_(4..C catalyst,indicating its applicability for their concurrent *** work extends the application of SACs in chemical sensing.

关键词： single-atom catalysts chemical sensing dopamine uric acid

Population genomic data reveal low genetic diversity,divergence and local adaptation among threatened Reeves's Pheasant(Syrmaticus reevesii)

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Avian Research 2024年第1期15卷 1-11页

作者： Qi Lu Pengcheng Wang jiang Chang De Chen Shenghan Gao Jacob Hoglund Zhengwang zhang Ministry of Education Key Laboratory for Biodiversity science and Ecological Engineering College of Life SciencesBeijing Normal UniversityBeijing100875China jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life SciencesNanjing Normal UniversityNanjing210023China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing100101China department of Ecology and Genetics Animal EcologyUppsala UniversityUppsalaSweden

Population genomic data could provide valuable information for conservation efforts;however,limited studies have been conducted to investigate the genetic status of threatened ***’s Pheasant(Syrmaticus reevesii)is facing population decline,attributed to increases in habitat *** is a knowledge gap in understanding the genomic status and genetic basis underlying the local adaptation of this threatened ***,we used population genomic data to assess population structure,genetic diversity,inbreeding patterns,and genetic ***,we identified candidate genes linked with adaptation across the current distribution of Reeves’s *** present study assembled the first de novo genome sequence of Reeves’s Pheasant and annotated 19,4.. *** also sequenced 30 individuals from three populations(Dabie Mountain,Shennongjia,Qinling Mountain)and found that there was clear population structure among those *** comparing with other threatened species,we found that Reeves’s Pheasants have low genetic *** of homozygosity suggest that the Shennongjia population has experienced serious *** demographic history results indicated that three populations experienced several declines during the glacial *** adaptative analysis among the populations identified 24..candidate genes under directional *** are involved in a large variety of processes,including the immune response and *** results suggest that the three populations should be considered as three different conservation *** current study provides genetic evidence for conserving the threatened Reeves’s Pheasant and provides genomic resources for global biodiversity management.

关键词： Conservation genetics Local adaptation Pheasant Whole-genome sequencing

A computational model of information processing in retina

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A computational model of information processing in retina

Community Detecting By Signaling on Complex Networks

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Yi-Yang LI,Dan zhang,Da-Hui WANG~* department of systems science,{4..beijing 100875,China

Objective In the visual system,experiments have shown the physiology of retina and the electrophysiological property of retinal neurons,including the response to proper stimulus and the adaptation to *** a visual object,retina transforms optical signals to electrophysiological signals which are transmitted to downstream neural system by ganglion cells as a ***,the overall features of efferent signal from ganglion cells are not very ***,we build a computational model of the retina based on the model by Momiji and the physiological structure of *** model includes the ON and OFF pathways which can be used to simulate the information processing in retina and investigate the overall features of retina efferent *** The model contains basic types of retinal neurons,i.e.,photoreceptor cell(RC),horizontal cell(HC),bipolar cell(BC), amacrine cell(AC)and ganglion cell(GC,includes MGC and PGC).The ON and OFF pathways start from *** ratios between each type of neurons obey RC:HC:BC:AC:MGC:PGC=25:25:6.25:6.25:4..** are placed on a 2-dimensional *** HC receives excitatory synaptic afference from 4..djacent RCs and forms electrical synapses with 8 adjacent *** ON-type BC receives inhibitory synaptic afference from 8 adjacent RCs while each OFF-type BC receives excitatory synaptic afference from 8 adjacent *** AC receives excitatory synaptic afference from 1 BC and feed back to it,each MGC receives excitatory synaptic afference from 8 adjacent BCs while each PGC receives excitatory synaptic afference from 3 adjacent *** use a set of differential equations to describe the cascade reaction after photon reaching RC,including the concentration of[PDE]increasing,[cGMP]hydrolyzing, cationic channels closing,the intracellular concentration of Caand H decreasing,and finally RC hyperpolarizing. The membrane potential of HC,BC and AC are described as differential *** GC,action potential generation currents of N

关键词： retina neural network computational model

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Community Detecting By Signaling on Complex Networks

A Comparative Definition of Community and Corresponding Identifying Algorithm

第四届全国网络科学学术论坛暨研究生暑期学校

作者： Yanqing Hu Menghui Li Peng zhang Ying Fan Zengru Di~* department of systems science,{4..enter for Complexity Research beijing normal university,beijing 100875,P.R.China

＜正＞Based on signaling process on copplex networks,a method for identifica- tion community structure is *** a network with n nodes,every node is coussmed to be a system which can send,receive,and recond *** node is taken as the initial signal source to inspire the whole network one time. Then the source node is endowed a n-dimensional vector which record the ef- fects of signaling *** this process,the topological relationship of nodes on the network could be transferred into the geometrical structure of vectors is n-dimensional Euclidian *** the best partition of groups is determined by F-statistics and the final community structure is given by K-means clus-tering method（KMC）.This method can detect community structure both in unweighted and weighted networks without any extra *** has been applied to ad hoc networks and some real networks such as Zachary Karate Club network and football team *** results indicate that the algo-rithm based on signaling process works well.

关键词： Complex network Community Structure Signaling Algorithm KMC

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A Comparative Definition of Community and Corresponding Iden...

第四届全国网络科学学术论坛暨研究生暑期学校

作者： Yanqing Hu Hongbin Chen Peng zhang Menghui Li Zengru Di Ying Fan~* department of systems science,{4..enter for Complerity Research,Baijing normal university,beijing 100875,P.R.China

＜正＞In this paper,a comperstive definition for community in networks is proposed and the corresponding detecting in given. A community is defined as a set of nodes,which satisfy that each node’s degree inside the community should not be smaller than the node’s degree toward any other community. In the algorithm,the sttractive force of a community to a node is defined as the connections between *** employing sttractive force based self-organizing process,without any extra parameter, the best communities can be *** artificial and real-world networks,including Zachary Karate chub network,Gollege football notwork and large Scientific collsboration network are *** algorithm works well in detecting communities and it also gives a nice deecription for network division and group formation.

关键词： Complex Network Community Structure Comparative Definition

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利用射影空间中的埃尔米特簇构作结合方案

系统科学与数学 2003年第3期23卷 289-294页

作者：王恺顺张更生北京师范大学数学系北京100875 河北师范大学数学系石家庄050016

本文把N+1维射影空间看作一个N+1维仿射空间X和一个N维无穷远超平面H的并,利用埃尔米特簇把H上的点集划分为3个子集,对X中任两点a和b,如果线ab与H的交点属于第i个子集,定义a和b属于第i个结合类,我们证明上述构作是一个结合方案,并计算... 详细信息

本文把N+1维射影空间看作一个N+1维仿射空间X和一个N维无穷远超平面H的并,利用埃尔米特簇把H上的点集划分为3个子集,对X中任两点a和b,如果线ab与H的交点属于第i个子集,定义a和b属于第i个结合类,我们证明上述构作是一个结合方案,并计算出其参数。

关键词：射影空间埃尔米特簇结合方案仿射空间超平面酉群奇异点

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关于劳动力迁移决策的模型分析

系统工程理论与实践 2004年第6期24卷 46-49页

作者：李克强林建姜璐北京师范大学系统科学系北京100875

　提出了扩展的Chiswick模型,并具体讨论了劳动力在迁入地与迁出地间的迁移决策问题,进而针对西部开发中的人才流失现象提出政策建议.

关键词：劳动力迁移工资

Amelioration of habitat since the early Holocene contributed to the origin of agriculture in the farming-pastoral zone of northern China

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science China Earth sciences 2024年第8期67卷 2535-2546页

作者： Xin JIA Zhiping zhang Yonggang SUN Runqi jiang Shuangwen YI Wei CHEN Jue SUN Guoqiang LI Shuzhi WANG Enrui LI Xiaonong HU Qingchun BAO Harry F.LEE Huayu LU jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China Schlool of History and Culture Chifeng UniversityChifeng 024000China school of Geography and Ocean science Nanjing UniversityNanjing 210023China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China Key Laboratory of Western China’s Environmental systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Archaeology Chinese Academy of Social SciencesBeijing 100710China Ulanqab Museum Ulanqab 012000China The Institute of Cultural Relics and Archaeology Hohhot 010011China department of Geography and Resource management The Chinese University of Hong KongHong Kong 999077China Key Laboratory of Virtual Geographic Environment(Ministry of Education of PRC) Nanjing Normal UniversityNanjing 210023China school of Geography Nanjing Normal UniversityNanjing 210023China Institute of Environmental Archaeology Nanjing Normal UniversityNanjing 210023China

The origin of agriculture in the farming-pastoral zone of northern China remains in *** central region of the Inner Mongolia Plateau is located in the core area of the farming-pastoral zone;thus,it is a critical region for exploring the origin of the dryland farming system in northern *** study selected the Yumin Site and Banan Site,which belong to the Yumin Culture-the beginning of Neolithic culture in Inner Mongolia-as the research *** on the quartz optically stimulated luminescence(OSL)dating on the sedimentary sections from the Yumin site(YM)and Banan site(BN1 and BN2),the Holocene chronology framework of each section was *** that,by identifying carbonized grains in the Yumin site and the multi-proxy analysis of each section,we investigated the relationship between the origin of agriculture and climate change in this *** results revealed that the timing of the origin of agriculture recorded in the Yumin site lagged behind the timing of a significant increase of precipitation during the early Holocene but coincided with the timing of a significant increase of vegetation around 8.4..** phenomenon was further confirmed by the published high-resolution paleoenvironmental records from the surrounding area of the Yumin *** propose that with the gradual amelioration of hydrothermal conditions since the beginning of the Holocene,the regional ecosystem had been improved,resulting in the gradual conversion of the land surface from infertile sand to organic-rich soil,providing an appropriate environmental foundation for the origin of dryland farming in northern China around 8.4..** study highlighted that the“accumulative environmental effects”during the early Holocene played a vital role in the origin of agriculture in northern China and provided a reference for agricultural management in the context of future climate change.

关键词： Origin of agriculture Accumulative environmental effects Yumin Culture Northern China Holocene

基于神经网络的Lyapunov指数谱的计算

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系统工程理论与实践 2001年第8期21卷 9-13,67页

作者：田宝国姜璐谷可北京师范大学系统科学系北京100875

利用 BP神经网络的非线性函数逼近能力 ,由实验观察数据列计算系统的 Lyapunov指数谱 .实例计算表明 ,此种方法精度较高且计算量较小。

关键词： Lyapunov指数谱相空间重构人工神经网络非线性动力系统分析学习算法