检索结果-南通市图书馆

NUMERICAL SIMULATION OF FLOW FOLD OF A RIVER WITH COMpLICATED BOUNDARIES

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1996年第3期8卷 75-80页

作者： Xu Wei-lin Liao Hua-sheng (State Key Hydraulics Lab. of high Speed Flows, Sichuan Union University, Chengdu 610065, p. R. China) Sichuan Union Univ Chengdu China

The flow field of a river with complicated boundaries is simulated by dividing the calculation domain into several subdomains and using the depth-averaged k-ε turbulence model. The complicated topographic conditions in this paper include bar, confluence, narrow, bay and bend, etc. The lands emerging from the water surface are treated as blocked-off regions. The calculation is achieved at both the low and the high water levels. The velocity profiles along cross-sections are measured at the high water level in physical model. The calculated and measured velocity profiles are in agreement.

关键词： numerical simulation natural river complicated boundary

Fermi surface gapping in the hidden order state of prFe_(4)p_(12);by point-contact spectroscopy

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2022年第3期65卷 99-105页

作者： Tian Le LiQiang Che Qi Huang kevin Huang ZhaoFeng Ding Lei Shu Xin Lu Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Center for Correlated Matter and Department of physics Zhejiang UniversityHangzhou 310058China State Key Laboratory of Surface physics Department of PhysicsFudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Zhejiang province Key Laboratory of Quantum Technology and Device Zhejiang UniversityHangzhou 310027China

We have applied point-contact spectroscopy(pCS) to investigate the nonmagnetic hidden order(HO) state of the skutterudite compound prFe_(4)p_(12) with its transition temperature THO~6.5 K. Its point-contact conductance curves exhibit a reproducible gap structure in the HO state below THOand its temperature dependent gap magnitude follows a BCS-like mean-field behavior.A Fano-like conductance shape is observed to emerge below the coherence temperature of prFe_(4)p_(12). In a magnetic field, the gap feature is gradually suppressed and evolves into a pronounced Fano peak, signaling the heavy fermion state and vividly demonstrating the competition between HO and the formation of heavy fermion states. Our results strongly suggest the itinerant characteristic of f electrons in prFe_(4)p_(12), which constrains theoretical models to explain the HO mechanism.

关键词： point-contact spectroscopy(pCS) hidden order heavy fermion Fermi surface gapping

Detailed derivation of the ^(3)p_(0) strong decay model applied to baryons

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2025年第1期49卷 139-153页

作者： T.Aguilar A.Capelo-Astudillo M.Conde-Correa A.Duenas-Vidal p.G.Ortega J.Segovia Departamento de Física Escuela Politécnica NacionalQuito 170143Ecuador Departamento de Física Fundamental Universidad de SalamancaE-37008 SalamancaSpain Instituto Universitario de Física Fundamental y Matemáticas(IUFFyM) Universidad de SalamancaE-37008 SalamancaSpain Departamento de Sistemas Físicos Químicos y NaturalesUniversidad Pablo de OlavideE-41013 SevillaSpain

By using the ^(3)p_(0) pair creation model,we provide a detailed derivation of the transition matrix for a baryon decaying into a meson-baryon *** analysis was successfully conducted for a meson in[***,***,and ***,***.B 715,322(2012),and we extend the same formalism to the baryon sector,focusing on the △(1232)→πN strong decay width because all hadrons involved in the reaction are very well established,the two hadrons in the final state are stable and require no further analysis,all quarks are light and thus equivalent,and the decay width of the process is relatively well *** a very common Rayleigh-Ritz variational method to solve the 2-and 3-body Schodinger bound-state equation in which the hadron's radial wave functions are expanded in terms of a Gaussian basis,we can relate the expression of the invariant matrix element with the mean-square radii of hadrons involved in the *** use their experimental measures in such a way that only the strength of the quark-antiquark pair creation from the vacuum is a free *** is then taken from our previous study on strong decay widths in the meson sector[***,***,and ***,***.B 715,322(2012),and the obtained results are compatible with the experimental results for the calculated △(1232)→πN decay *** requiring the calculation of additional baryon strong decays,a feasible avenue towards a unified description of both baryon and meson strong decay widths within a single constituent quark model framework may be ***,this research has been developed to lay the foundation for a novel raft of applications to exotic hadrons,i.e.,the description of the baryon's coupling to meson-baryon thresholds,one of the mechanisms that is considered to be responsible for providing either a large renormalization to naive states or genuine dynamicallygenerated meson-baryon molecules.

关键词： baryon strong decays ^(3)p_(0)decay model quark model

Expansion properties for finite subdivision rules I Dedicated to the Memories of William p. Thurston and Lei Tan

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

Science China Mathematics 2018年第12期61卷 2237-2266页

作者： William J.Floyd Walter R.parry kevin M.pilgrim Department of Mathematics Virginia Tech Department of Mathematics and Statistics Eastern Michigan University Department of Mathematics Indiana University

Among Thurston maps (orientation-preserving, postcritically finite branched coverings of the 2-sphere to itself), those that arise as subdivision maps of a finite subdivision rule form a special family. For such maps, we investigate relationships between various notions of expansion—combinatorial, dynamical, algebraic,and coarse-geometric.

关键词： finite subdivision rule expanding map postcritically finite Thurston map

Robust Detection and Analysis of Smart Contract Vulnerabilities with Large Language Model Agents

在线全文

学校读者我要写书评

暂无评论

Journal of Information Security 2025年第1期16卷 197-226页

作者： Nishank p. Kuppa Vijay K. Madisetti College of Computing Georgia Institute of Technology Atlanta GA USA School of Cybersecurity and privacy Georgia Institute of Technology Atlanta GA USA

Smart contracts on the Ethereum blockchain continue to revolutionize decentralized applications (dApps) by allowing for self-executing agreements. However, bad actors have continuously found ways to exploit smart contracts for personal financial gain, which undermines the integrity of the Ethereum blockchain. This paper proposes a computer program called SADA (Static and Dynamic Analyzer), a novel approach to smart contract vulnerability detection using multiple Large Language Model (LLM) agents to analyze and flag suspicious Solidity code for Ethereum smart contracts. SADA not only improves upon existing vulnerability detection methods but also paves the way for more secure smart contract development practices in the rapidly evolving blockchain ecosystem.

关键词： Blockchain Ethereum Smart Contracts Security Decentralized Applications Web3 Cryptocurrency Large Language Models

Biopolymer Decorated pencil Graphite Electrode for the In-situ Quantification of L-Tryptophan in Dietary Supplements

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 Analysis and Testing 2025年第01期 82-95页

作者： V.Devika p.J.Sreelekshmi B.Vedhanarayanan Sandhya Sadanandan R.Rejithamol Department of Chemistry Amrita Vishwa Vidyapeetham Graduate School of Science Chiba University Department of Chemistry School of Advanced SciencesVIT-AP University

A simplistic and novel electrochemical sensor for selectively detecting the essential amino acid tryptophan in dietary supplements was fabricated on a pencil graphite electrode modified with a tryptophan-based dipeptide. The dipeptide was synthesized using common synthetic strategy for amino acid couplings. The modified electrode was characterized by scanning electron microscopy, impedance spectroscopy, cyclic voltammetry, and infrared spectroscopy. Differential pulse voltammetry was used to study the electrochemical response of the fabricated electrode to tryptophan in dietary supplements. Under the optimized experimental conditions, a distinct oxidation peak at + 0.671 V corresponding to tryptophan was noticed in differential pulse voltammetry, which indicated the detection of tryptophan by the fabricated electrode. The oxidation peak current for tryptophan was found to be linear within a concentration range of 10–350 μM with a lower detection limit of 1.2 μM, and the sensitivity of the fabricated electrode was 6.9 μA/μM/cm 2. Excellent selectivity, permissible reproducibility, and good stability of the sensor make it undoubtedly suitable for determining tryptophan in dietary supplements.

关键词：

Heterogeneity of mature oligodendrocytes in the central nervous system

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam M.R.Groh Moein Yaqubi Qiao-Ling Cui Jo Anne Stratton G.R.Wayne Moore Jack p.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Department of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by Robertson and Río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus RNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity from temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics promise a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

EDA: an enhanced dual-active algorithm for location privacy preservation in mobile p2p networks

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第5期14卷 356-373页

作者： Yan-zhe CHE kevin CHIEW Xiao-yan HONG Qiang YANG Qin-ming HE College of Computer Science and Technology Zhejiang University School of Engineering Tan Tao University Department of Computer Science University of Alabama College of Electrical Engineering Zhejiang University

Various solutions have been proposed to enable mobile users to access location-based services while preserving their location privacy. Some of these solutions are based on a centralized architecture with the participation of a trustworthy third party, whereas some other approaches are based on a mobile peer-to-peer (p2p) architecture. The former approaches suffer from the scalability problem when networks grow large, while the latter have to endure either low anonymization success rates or high communication overheads. To address these issues, this paper deals with an enhanced dual-active spatial cloaking algorithm (EDA) for preserving location privacy in mobile p2p networks. The proposed EDA allows mobile users to collect and actively disseminate their location information to other users. Moreover, to deal with the challenging characteristics of mobile p2p networks, e.g., constrained network resources and user mobility, EDA enables users (1) to perform a negotiation process to minimize the number of duplicate locations to be shared so as to significantly reduce the communication overhead among users, (2) to predict user locations based on the latest available information so as to eliminate the inaccuracy problem introduced by using some out-of-date locations, and (3) to use a latest-record-highest-priority (LRHp) strategy to reduce the probability of broadcasting fewer useful locations. Extensive simulations are conducted for a range of p2p network scenarios to evaluate the performance of EDA in comparison with the existing solutions. Experimental results demonstrate that the proposed EDA can improve the performance in terms of anonymity and service time with minimized communication overhead.

关键词： Location-based service privacy preservation Spatial cloaking Mobile peer-to-peer networks

Resistive Switching Memory of TiO2 Nanowire Networks Grown on Ti Foil by a Single Hydrothermal Method

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2017年第2期9卷 23-31页

作者： Ming Xiao kevin p.Musselman Walter W.Duley Norman Y.Zhou Centre for Advanced Materials Joining University of WaterlooWaterlooON N2L 3G1Canada Waterloo Institute of Nanotechnology University of WaterlooWaterlooON N2L 3G1Canada Department of Mechanics and Mechatronics Engineering University of WaterlooWaterlooON N2L 3G1Canada Department of physics and Astronomy University of WaterlooWaterlooON N2L 3G1Canada

The resistive switching characteristics of TiO_2 nanowire networks directly grown on Ti foil by a single-step hydrothermal technique are discussed in this paper. The Ti foil serves as the supply of Ti atoms for growth of the TiO_2 nanowires, making the preparation straightforward. It also acts as a bottom electrode for the device. A top Al electrode was fabricated by e-beam evaporation process. The Al/TiO_2 nanowire networks/Ti device fabricated in this way displayed a highly repeatable and electroforming-free bipolar resistive behavior with retention for more than 10~4 s and an OFF/ON ratio of approximately 70. The switching mechanism of this Al/TiO_2 nanowire networks/Ti device is suggested to arise from the migration of oxygen vacancies under applied electric field. This provides a facile way to obtain metal oxide nanowire-based Re RAM device in the future.

关键词： TiO2 nanowire networks Resistive switching memory Ti foil Hydrothermal process Al electrode