检索结果-南通市图书馆

Sequence Stratigraphy of Upper Proterozoic Glacigenous Rocks in Southeastern Margin of Yangtze Platform

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth science 1996年第1期15卷 38-45页

作者： jiang Ganqing Wang Ziqiang zhang Linghua (department of Geology and Mineral Resources, china.university of Geosciences, beijing 100083)

The Upper Proterozoic glacigenous rocks in the southeastern margin of the Yangtze platform were accumulated in a glacially influenced marine environment with extension set- ting. Two type I depositional sequences have been identified in the glacioclastic sediments the their boundaries enhanced by both tectonism and the incision of glaciation. The lower sequence (SQ1), comprising Changan and Fulu formations (Guangxi Province), jiangkou and Xiangmen formations(Hunan Province) and their equivalents, is bounded by erosional unconformities both at the base and on the top. The upper sequence (SQ2), composed mainly of Nantuo Formation and its equivalents, is confined by an erosional unconformity at the base and covered by an exposure surface of karstification on the top. The depositional systems tracts are difficult to be distinguished directly and mainly characterized by the variation in glacioclastic supplies. Two types of episodic parasequeuces can be identified in the glacigenous rocks and are related to the evolution of depositional systems tracts. Both the sequences and parasequences are caused by autocyclic mechanism. The present research shows that the Upper Proterozoic glacigenous deposits are of significance for the analysis of the tectonic evolution of the Late Precambrian basin in South china.

关键词： glacigenous rock sequence stratigraphy Upper Proterozoic Yangtze platform.

Effects and fate of metal-based engineered nanomaterials in soil ecosystem: A review

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第5期34卷 843-852页

作者： Qibin WANG Peng zhang Weichen ZHAO Shakoor NOMAN Adeel MUHAMMAD Guikai ZHU Yi SUN Quanlong WANG Yaqi jiang Yukui RUI beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation College of Resources and Environmental Sciences China Agricultural University department of Environmental science and Engineering University of Science and Technology of China school of Geography Earth and Environmental Sciences University of Birmingham BNU-HKUST Laboratory of Green Innovation Advanced Institute of Natural Sciences Beijing Normal University at Zhuhai china.Agricultural university Professor Workstation of Yuhuangmiao Town china.Agricultural university Professor Workstation of Sunji Town

Metal-based engineered nanomaterials (MENMs) are increasingly being used in people’s working lives. Although MENMs have important effects on soil ecosystem and play an important role in solving soil environmental problems, the hazards associated with MENMs cannot be ignored. Therefore, more and more scholars have studied the behavior and effects of nanomaterials in soils in recent years. In this review, we explore the articles on MENMs and soil ecosystem retrieved from various databases from 2013 to 2022. We discuss the mechanisms of MENM toxicity, the current state of soil ecosystem, the ecological effects of MENMs on soil microbes, earthworms, and plants, and the ways by which soil organisms take up MENMs. We now know that although MENMs have positive effects on soil ecosystem, their potential hazards are not negligible. Therefore, it is necessary to investigate the effects of MENMs on soil organisms. Meanwhile, we should pay more attention to the negative effects of MENMs on soil ecosystem while exploring their positive effects on soil ecosystem in future research.

关键词： earthworm nanomaterial migration and transformation nanotechnology plant soil microorganism toxicity

A Comparative Definition of Community and Corresponding Identifying Algorithm

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Comparative Definition of Community and Corresponding Iden...

Updating verbal and visuospatial working memory: Are the processes parallel?

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,school of management.Center 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

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese science Bulletin 2008年第14期53卷 2175-2185页

作者： YUE ZhenZhu1,2, zhang Ming3,4 & ZHOU XiaoLin1 1 department of Psychology, Peking university, beijing 100871, china.2 Biological Psychology and Neuropsychology, university of Hamburg, Von-Melle-Park 11, 20146 Hamburg, Germany 3 department of Psychology, Northeast normal university, Changchun 130024, china.4 Key Laboratory for Applied Statistics of MOE, Northeast normal university, Changchun 130024, china department of Psychology Peking University Beijing China Biological Psychology and Neuropsychology University of Hamburg Hamburg Germany department of Psychology Northeast Normal University Changchun China Key Laboratory for Applied Statistics of MOE Northeast Normal University Changchun China

The current study compared the processes of updating verbal and visuospatial working memory (WM) and examined the roles of central executive and slave systems in working memory updating tasks, by changing the number of items updated simultaneously to manipulate the load on central executive. Ex- periment 1 used the verbal WM updating task, and the results validated the efficiency of the paradigm to manipulate the load on central executive. Experiment 2 employed the verbal WM updating task, with the articulatory suppression task to interfere with the phonological loop. The results supported the study by Morris and Jones, revealing that the central executive system played an important role in the updating component of verbal WM, while the phonological loop was responsible for the serial recall component. Experiment 3 employed the visuospatial WM updating task, with the spatial tapping task to interfere with the visuospatial sketchpad. The results suggested that the visuospatial sketchpad and the central execu- tive together dealt with the updating component, while the visuospatial sketchpad was responsible for the serial recall component by itself. These results are consistent with the findings that visuospatial sketch- pad has close links with central executive, while the phonological loop is separated from the central ex- ecutive. It suggests that updating visuospatial and verbal WM are not two parallel processes.

关键词：记忆储存工作记忆中枢神经视觉性

Spectrum quantification-based safety efficiency evaluation of autonomous vehicle under random cut-in scenarios

在线全文

学校读者我要写书评

暂无评论

Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2024年第3期7卷 205-218页

作者： jiang Chen Weiwei zhang Miao Liu Xiaolan Wang Jun Gong Jun Li Boqi Li Jiejie Xu school of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China Shanghai Smart Vehicle Cooperating Innovation Center Co. Ltd.Shanghai 201805China school of Vehicle and Mobility Tsinghua UniversityBeijing 100084China department of Mechanical Engineering University of MichiganAnn ArborMI 48109USA

Continuous-scale trusted safety efficiency evaluation is crucial for the agile development and robust validation of autonomous vehicle *** the UN R157 Regulation evaluates automated lane-keeping system(ALKS)performance baselines through safe collision plots(SCPs)in various scenario clusters,quantifying the specific ALKS safety efficiency remains *** propose a spectrum quantification approach to evaluate the safety efficiency of autonomous vehicles in cut-in ***,we collected speed-distance data under different cut-in scenarios and extracted essential spectral features to indicate the vehicle motion parameters during the cut-in ***,by utilizing Fourier analysis,a spectral analysis model was built to quantify and analyze the vehicle motion characteristics,providing insights into scenario ***,we created approximate analytical equations for the normalized disturbance frequencies in the nonlinear response scenarios of autonomous driving systems by combining the SCP with a frequency spectrum analysis *** results showed that the normalized disturbance frequency in the cut-in scenario was approximately *** the relative longitudinal distance and speed of the vehicle are the same,if the cut-in speed of the cut-in vehicle is larger,the normalized disturbance frequency is higher,indicating that the cut-in process of the autonomous vehicle is more dangerous and may trigger a collision.

关键词： safety efficiency evaluation automated lane-keeping system(ALKS) cut-in scenario frequency quantify

Non-destructive buffer enabling near-infrared-transparent inverted inorganic perovskite solar cells toward 1400 h light-soaking stable perovskite/Cu(In,Ga)Se_(2) tandem solar cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第10期97卷 622-629,I0013页

作者： Yu zhang Zhaoheng Tang Zhongyang zhang Jiahong Tang Minghua Li Siyuan Zhu Wenyan Tan Xi Jin Tongsheng Chen Jinsong Hu Chao Zhou Chunlei Yang Qijie Liang Xugang Guo Weimin Li Weiqiang Chen Yan jiang MOE Key Laboratory of Laser Life science&Guangdong Provincial Key Laboratory of Laser Life science Guangzhou Key Laboratory of Spectral Analysis and Functional ProbesCollege of BiophotonicsSouth China Normal UniversityGuangzhou 510631GuangdongChina school of Materials science and Engineering Beijing Institute of TechnologyBeijing 100081China Songshan Lake Materials Laboratory Dongguan 523429GuangdongChina department of Materials science and Engineering Guangdong Provincial Key Laboratory of Functional Oxide Materials and DevicesSouthern University of Science and TechnologyShenzhen 518055GuangdongChina beijing Advanced Innovation Center for Soft Matter science and Engineering College of Chemical EngineeringCollege of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China department of Physics Liaoning UniversityShenyang 110036LiaoningChina beijing National Laboratory for Molecular sciences(BNLMS) Institute of ChemistryChinese Academy of SciencesBeijing 100190China school of Physics and Materials science Guangzhou UniversityGuangzhou 510006GuangdongChina Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 18055GuangdongChina

Near-infrared(NIR)transparent inverted all-inorganic perovskite solar cells(PSCs)are excellent top cell candidates in tandem *** essential challenge is the replacement of metal contacts with transparent conductive oxide(TCO)electrodes,which requires the introduction of a buffer layer to prevent sputtering *** this study,we show that the conventional buffers(i.e.,small organic molecules and atomic layer deposited metal oxides)used for organic-inorganic hybrid perovskites are not applicable to all-inorganic perovskites,due to non-uniform coverage of the vulnerable layers underneath,deterioration upon ion bombardment and moisture induced perovskite phase transition,A thin film of metal oxide nanoparticles by the spin-coating method serves as a non-destructive buffer layer for inorganic ***-inorganic inverted near-infrared-transparent PSCs deliver a PCE of 17.46%and an average transmittance of 73.7%between 780 and 1200 *** combination with an 18.56%Cu(In,Ga)Se_(2) bottom cell,we further demonstrate the first all-inorganic perovskite/CIGS 4-T tandem solar cell with a PCE of 24.75%,which exhibits excellent illumination stability by maintaining 86.7%of its initial efficiency after 1400 *** non-destructive buffer lays the foundation for efficient and stable NIR-transparent inverted inorganic perovskite solar cells and perovskite-based tandems.

关键词： CsPbI_(3)perovskite Inverted perovskite solar cells Tandem solar cells Buffer layer Stability

在线全文

学校读者我要写书评

暂无评论

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

Mechanism of Guangdong Shenqu in regulating intestinal flora in mice with food stagnation and internal heat based on 16S rDNA sequencing Author links open overlay panel

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medical sciences 2024年第2期11卷 232-244页

作者： Yani jiang Zhenhong zhang Han Chen Yanmin Wang Yanrui Xu Zijie Chen Yan Xu Jingjuan Wang school of Chinese Materia Medica Beijing University of Chinese MedicineBeijing102488China school of Chinese Traditional Medicine Beijing University of Chinese MedicineBeijing102488China department of Chemistry Cleveland State UniversityCleveland44115USA

Objective To investigate the effect of Guangdong Shenqu(GSQ)on intestinal flora structure in mice with food stagnation through 16S rDNA *** Mice were randomly assigned to control,model,GSQ low-dose(GSQL),GSQ medium-dose(GSQM),GSQ high-dose(GSQH),and lacidophilin tablets(LAB)groups,with each group containing 10 mice.A food stagnation and internal heat mouse model was established through intragastric administration of a mixture of beeswax and olive oil(1:15).The control group was administered normal saline,and the model group was administered beeswax and olive oil to maintain a *** GSQL(2 g/kg),GSQM(4 g/kg),GSQH(8 g/kg),and LAB groups(0.625 g/kg)were administered corresponding drugs for 5 *** administration,16S rDNA sequencing was performed to assess gut microbiota in mouse fecal *** The model group exhibited significant intestinal flora *** GSQ administration,the abundance and diversity index of the intestinal flora increased significantly,the number of bacterial species was regulated,andαandβdiversity were *** administration increased the abundance of probiotics,including Clostridia,Lachnospirales,and Lactobacillus,whereas the abundance of conditional pathogenic bacteria,such as Allobaculum,Erysipelotrichaceae,and Bacteroides *** prediction analysis indicated that the pathogenesis of food stagnation and GSQ intervention were primarily associated with carbohydrate,lipid,and amino acid metabolism,among other metabolic *** The digestive mechanism of GSQ may be attributed to its role in restoring diversity and abundance within the intestinal flora,thereby improving the composition and structure of the intestinal flora in mice and subsequently influencing the regulation of metabolic pathways.

关键词： Guangdong Shenqu Food stagnation Gut microbiota High-throughput gene sequencing Species annotation Metabolic pathway

基于神经网络的Lyapunov指数谱的计算

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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