检索结果-南通市图书馆

Neuroscience Bulletin 2017年第6期33卷 653-663页

作者： Zi-Fang Zhao xue-zhu li You Wan Neuroscience Research Institute Peking UniversityBeijing 100191China Department of Neurobiology School of Basic Medical SciencesPeking UniversityBeijing 100191China Key Laboratory for Neuroscience Ministry of Education/National Health and Family Planning CommissionPeking UniversityBeijing 100191China

The local field potential（LFP） is a signal reflecting the electrical activity of neurons surrounding the electrode tip. Synchronization between LFP signals provides important details about how neural networks are organized. Synchronization between two distant brain regions is hard to detect using linear synchronization algorithms like correlation and coherence. Synchronization likelihood（SL） is a non-linear synchronization-detecting algorithm widely used in studies of neural signals from two distant brain areas. One drawback of non-linear algorithms is the heavy computational burden. In the present study, we proposed a graphic processing unit（GPU）-accelerated implementation of an SL algorithm with optional 2-dimensional time-shifting. We tested the algorithm with both artificial data and raw LFP data. The results showed that this method revealed detailed information from original data with the synchronization values of two temporal axes,delay time and onset time, and thus can be used to reconstruct the temporal structure of a neural network. Our results suggest that this GPU-accelerated method can be extended to other algorithms for processing time-series signals（like EEG and f MRI） using similar recording techniques.

关键词： Local field potential Synchronization Temporal Time-shifting Parallel computing

Influence of temperature on thermal relaxation of exchange bias field in CoFe/Cu/CoFe/IrMn spin valve

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第10期30卷 554-559页

作者： Xian-Jin Qi Ni-Na Yang Xiao-Xu Duan xue-zhu li Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction Ministry of EducationKunming University of Science and TechnologyKunming 650093China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China

A multilayered spin valve film with a structure of Ta(5 nm)/Co_(75)Fe_(25)(5 nm)/Cu(2.5 nm)/Co_(75)Fe_(25)(5 nm)/Ir_(20)Mn_(80)(12 nm)/Ta(8 nm)is prepared by the high-vacuum direct current(DC)magnetron *** effect of temperature on the spin valve structure and the magnetic properties are studied by x-ray diffraction(XRD),atomic force microscopy(AFM),and vibrating sample *** effect of temperature on the exchange bias field thermomagnetic properties of multilayered spin valve is studied by the residence time of samples in a reverse saturation *** results show that as the temperature increases,the IrMn(111)texture weakens,surface/interface roughness increases,and the exchange bias field *** 200℃,the exchange bias field decreases with the residence time increasing,and at the beginning of the negative saturation field,the exchange bias field Hex decreases first quickly and then slowly *** the temperature is greater than 200℃,the exchange bias field is unchanged with the residence time increasing.

关键词： exchange bias field spin valves temperature thermal relaxation

Low-temperature graphitization of lignin via Co-assisted electrolysis in molten salt

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第9期9卷 1449-1458页

作者： Shijie li Wei-li Song xue Han Qingqing Cui Yan-li zhu Shuqiang Jiao Institute of Advanced Structure Technology Beijing Institute of Technology State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

The ever-growing energy demand and environmental issues have stimulated the development of sustainable energy ***,an efficient and environmentally friendly electrochemical transformation technology was proposed to prepare highly graphitized carbon materials from an abundant natural resource-lignin （LG）.The preparation process mainly includes pyrolytic carbonization of raw LG material and electrochemical conversion of amorphous carbon ***,with the assistance of Co catalyst,the graphitization degree of the products was significantly improved,in which the mechanism was the removal of heteroatoms in LG and the rearrangement of carbon atoms into graphite ***,tunable microstructures （nanoflakes） under catalytic effects could also be observed by controlling the electrolytic *** with the products CN1 （without catalyst） and CN5 （with 10%catalyst）,the specific surface area are 158.957 and202.246 m2g-1,*** used as the electrode material for lithium-ion batteries,CN5 delivered a competitive specific capacity of～350 m Ah g-1（0.5 C） compared with commercial *** strategy proposed in this work provides an effective way to extract value-added graphite materials from lignin and can be extended to the graphitization conversion of any other amorphous carbon precursor materials.

关键词： lignin Graphitic carbon Electrochemical conversion lithium-ion batteries

Electrocatalytic Oxidation of NADH Based on Self-assembled Colloidal Gold and Nafion Matrixes and Co Complex Mediator

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第5期17卷 683-686页

作者： Na WANG Ruo YUAN Ya Qin CHAI Dian Ping TANG Qiang zhu xue lian li Chongqing Key Laboratory of Analytical Chemistry College of Chemistry and Chemical Engineering Southwest University Chongqing 400715

A novel approach based on self-assembled colloidal gold and Nation matrixes and Co complex mediator to construct Co（bpy）3^3＋/nano-Au/Co（bpy）3^3＋/nafion/GC electrode, on which formed stable redox-active films. This electrode can decrease the overpotential about 330 mV for the oxidation of NADH with high stability, wide linear range and low detection limit.

关键词： Electrocatalysis NADH gold nanoparticles Co(bpy)3^3+ Nation. coenzymes

Use of DNA barcode sensu lato to identify traditional Tibetan medicinal plant Gentianopsis paludosa(Gentianaceae)

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2011年第3期49卷 267-270页

作者： Chun-Ying xue* De-zhu li(Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650204,China) (Key Laboratory of Biodiversity and Biogeography Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China) *Correspondence: Chun-Ying xue *Correspondence: ?Author for correspondence. E-mail: chyxue@*** Tel.: 86-871-5223508 Fax: 86-871-5217791.

Gentianopsis paludosa(Hook.f.) Ma(Gentianaceae) is an important species in Tibetan folk medicine commonly used to clear away the "heat evils" and toxic materials.A survey of market samples revealed that nine adulterant species,Gentianopsis barbata,***,***,Halenia elliptica,Lomatogonium macranthum,***,Swertia angustifolia,*** and ***,are often marketed as *** to distinguish *** from its adulterants are limited by current morphological and chemical *** sequence analysis of the nuclear ribosomal DNA internal transcribed spacer region(ITS) was used in the differentiation of *** from the adulterant *** data showed that the internal transcribed spacer regions differ significantly between *** and all nine adulterant species,so that they could be easily distinguished at the DNA level.

关键词： Gentianaceae Gentianopsis paludosa identification nrDNA ITS Tibetan medicine.

Striking Stabilization Effect of Spinel Cobalt Oxide Oxygen Evolution Electrocatalysts in Neutral pH by Dual-Sites Iron Incorporation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第2期7卷 152-160页

作者： Shuairu zhu xue Wang Jiabo Le Na An Jianming li Deyu liu Yongbo Kuang Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences1219 Zhongguan West RoadNingbo 315201China Zhejiang Institute of Tianjin University 85 Zhongguan West RoadNingbo 315201China Research Center of New Energy Research Institute of Petroleum Exploration&Development20 Xueyuan RoadBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences19(A)Yuquan RoadBeijing 100049China

Developing stable and efficient nonprecious-metal-based oxygen evolution catalysts in the neutral electrolyte is a challenging but essential goal for various electrochemical ***,cobalt-based spinels have drawn a considerable amount of attention but most of them operate in alkali ***,the frequently studied Co-Fe spinel system never exhibits appreciable stability in nonbasic conditions,not to mention attract further investigation on its key structural motif and transition states for activity ***,we report exceptional stable Co-Fe spinel oxygen evolution catalysts(~30%Fe is optimal)in a neutral electrolyte,owing to its unique metal ion arrangements in the crystal *** introduced iron content enters both the octahedral and tetrahedral sites of the spinel as Fe^(2+)and Fe^(3+)(with Co ions having mixed distribution as well).Combining density functional theory calculations,we find that the introduction of Fe to Co_(3)O_(4)lowers the covalency of metal-oxygen bonds and can help suppress the oxidation of Co^(2+/3+)and 0^(2-).It implies that the Co-Fe spinel will have minor surface reconstruction and less lattice oxygen loss during the oxygen evolution reaction process in comparison with Co_(3)O_(4)and hence show much better *** findings suggest that there is still much chance for the spinel structures,especially using reasonable sublattices engineering via multimetal doping to develop advanced oxygen evolution catalysts.

关键词： dual-sites iron electrocatalyst stability neutral electrolyte oxygen evolution reaction spinel oxides

A General Framework for Intelligent IoT Data Acquisition and Sharing in an Untrusted Environment Based on Blockchain

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第3期21卷 137-148页

作者： Lu Yin xue Yongtao li Qingyuan Wu Luocheng li Taosen Yang Peipei zhu Hongbo College of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of EducationNanjing 210003China Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China Research Institute of Internet of Things Nanjing University of Posts and TelecommunicationsNanjing 210003China Bell Honors School Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Automation Nanjing University of Posts and TelecommunicationsNanjing 210023China

Traditional Io T systems suffer from high equipment management costs and difficulty in trustworthy data sharing caused by *** provides a feasible research direction to solve these problems. The main challenge at this stage is to integrate the blockchain from the resourceconstrained Io T devices and ensure the data of Io T system is credible. We provide a general framework for intelligent Io T data acquisition and sharing in an untrusted environment based on the blockchain, where gateways become Oracles. A distributed Oracle network based on Byzantine Fault Tolerant algorithm is used to provide trusted data for the blockchain to make intelligent Io T data trustworthy. An aggregation contract is deployed to collect data from various Oracle and share the credible data to all on-chain users. We also propose a gateway data aggregation scheme based on the REST API event publishing/subscribing mechanism which uses SQL to achieve flexible data aggregation. The experimental results show that the proposed scheme can alleviate the problem of limited performance of Io T equipment, make data reliable, and meet the diverse data needs on the chain.

关键词： blockchain data sharing Internet of Things Oracle

Digital CEOs in Digital Enterprises:Automating,Augmenting,and Parallel in Metaverse/CPSS/TAOs

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 820-823页

作者： Juanjuan li Rui Qin Sangtian Guan Xiao xue Peng zhu Fei-Yue Wang with State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China the College of Intelligence and Computing Tianjin UniversityTianjin 300072China School of Economics and Management Nanjing University of Science and TechnologyNanjing 210094China the State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China

BIG models or foundation models are rapidly emerging as a key force in advancing intelligent societies[1]–[3]Their significance stems not only from their exceptional ability to process complex data and simulate advan... 详细信息

关键词： exceptional Auto advancing

Tipping Point Detection Using Reservoir Computing

在线全文

学校读者我要写书评

暂无评论

Research 2024年第1期2023卷 779-790页

作者： Xin li Qunxi zhu Chengli Zhao Xuzhe Qian xue Zhang Xiaojun Duan Wei lin College of Science National University of Defense TechnologyChangshaHunan 410073China Research Institute of Intelligent Complex Systems and MOE Frontiers Center for Brain Science Fudan UniversityShanghai 200433China Shanghai Artificial Intelligence Laboratory Shanghai 200232China School of Mathematical Sciences SCMSSCAMand CCSBFudan UniversityShanghai 200433China

Detection in high fidelity of tipping points,the emergence of which is often induced by invisible changes in internal structures or/and external interferences,is paramountly beneficial to understanding and predicting complex dynamical systems(CDSs).Detection approaches,which have been fruitfully developed from several perspectives(e.g.,statistics,dynamics,and machine learning),have their own advantages but still encounter difficulties in the face of high-dimensional,fluctuating ***,using the reservoir computing(RC),a recently notable,resource-conserving machine learning method for reconstructing and predicting CDSs,we articulate a model-free framework to accomplish the detection only using the time series observationally recorded from the underlying unknown CDSs.

关键词： computing record ping

Inhibition of Heterogeneous Nucleation in Water by Hydrogel Coating

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

Research 2024年第2期2023卷 139-147页

作者： Siyang li Panpan zhu Yaoting xue Lei Wangg Tuck-Whye Wong Xuxu Yang Haoei Zhou Tiefeng li We Yang Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang UniversityHangzhou 310027China Center for X-Mechanics Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China School of Biomedical Engineering and Health Sciences and Advanced Membrane Technology Research Centre Universiti Teknologi MalaysiaSkudai 81310Malaysia

Heterogeneous nucleation plays a critical role in the phase transition of water,which can cause damage in various ***,we report that heterogeneous nucleation can be inhibited by utilizing hydrogel coatings to isolate solid surfaces and ***,which contain over 90%water when fully swelled,exhibit a high degree of similarity to *** to this similarity,there is a great energy barrier for heterogeneous nucleation along the water-hydrogel ***,hydrogel coatings,which possess polymer networks,exhibit higher fracture energy and more robust adhesion to solid surfaces compared to *** high fracture and adhesion energy acts as a deterrent for fracture nucleation within the hydrogel or along the hydrogel-solid *** a hydrogel layer approximately 100μm thick,the boiling temperature of water under atmospheric pressure can be raised from 100 to 108℃.Notably,hydrogel coatings also result in remarkable reductions in cavitation pressure on multiple solid *** have demonstrated the efficacy of hydrogel coatings in preventing damages resulting from acceleration-induced *** coatings have the potential to alter the energy landscape of heterogeneous nucleation on the water-solid interface,making them an exciting avenue for innovation in heat transfer and fluidic systems.

关键词： fracture cavitation similarity