检索结果-南通市图书馆

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图书情报学的学术思想与技术方法及其开新

中国图书馆学报 2019年第2期45卷 15-25页

作者：叶鹰南京大学信息管理学院

本文对图书情报学已有学术思想与技术方法按外引和内生两类进行梳理,指出"三个世界"理论、"老三论"等是外引思想与方法的典型,而阮冈纳赞图书馆学五定律、布鲁克斯情报学理论、加菲尔德引文分析法则是内生思想与方法的标志。定基极小设... 详细信息

本文对图书情报学已有学术思想与技术方法按外引和内生两类进行梳理,指出"三个世界"理论、"老三论"等是外引思想与方法的典型,而阮冈纳赞图书馆学五定律、布鲁克斯情报学理论、加菲尔德引文分析法则是内生思想与方法的标志。定基极小设定极大展开基本原理,逻辑推论以书—人—用为形式架构、数据—信息—知识为内容架构的图书情报学思想体系,进而提出数据治理、信息优化、知识解析三大研究方向中的十类研究问题,包括:①数字图书馆和数字信息管理;②数字化知识传承和数据驱动学术研究;③关联数据与数据智能;④大数据分析与AI数据分析;⑤网络化信息组织;⑥多维信息检索;⑦智能信息分析;⑧知识表达及处理;⑨知识分析及可视化;⑩学术评价。文章概略揭示对图书情报学研究有启示作用的学术思想与技术方法及其开新。

关键词：图书情报学书理学学术思想技术方法二重证据法

Vibrations of An Isotropic Elastic Plate with One Rigidly Fixed Face

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Vibrations of An Isotropic Elastic Plate with One Rigidly Fi...

第二届全国压电和声波理论及器件技术研讨会

作者： Peter C.y.Lee Department of Civil and Environmental Engineering Princeton UniversityPrincetonNew Jersey 08544USA

Surface acoustic wave resonators are fabricated on a finite elastic substrate with proper *** the analysis and design,it is natural and important to consider the finite size and boundary conditions that are different from the ideal Rayleigh waves existing in the vicinity of a free surface of a semi-infinite elastic *** the analysis of the wave propagation of finite elastic solids with complications such as electrodes,mountings,and boundary conditions,approximate theory has to be developed based on dominant vibration modes and actual boundary *** considering the effect of mountings in a finite elastic plate and vibration mode changes,we start from an elastic plate with one face rigidly fixed to examine the vibration frequency and mode changes in the vicinity of the surface acoustic wave *** an isotropic elastic plate,we introduce two potential functions for the three-dimensional elasticity *** satisfying the boundary conditions of one rigidly fixed face and one free face are obtained along with frequency *** is found that with the increase of the plate thickness,solutions of the velocity and displacements approach to Rayleigh wave solutions we are familiar *** further obtain the stresses of the plate with known plate thickness and wave velocity to see the overall changes in addition to the velocity itself and *** plot the velocity and displacements as functions of the plate thickness to study the effect of boundary conditions on the wave *** results will be used in the analysis of surface acoustic waves in finite solids in conjunction of our recent work on the two-dimensional theory for the analysis of surface wave propagation in finite *** analytical methods and procedures are essential in the analysis and design of surface acoustic wave resonators,which are based on finite anisotropic piezoelectric solids with complications.

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非球形颗粒离散元接触模型和方法三十年发展概述

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Acta Mechanica Sinica 2023年第1期39卷 44-84页

作者：冯云田 Zienkiewicz Centre for Computational Engineering Faculty of Science and Engineering Swansea University UK

离散元方法(DEM)自1979年提出以来,在过去四十年中取得了显著的发展.本文旨在选择性地概述离散元方法中非球形颗粒接触模型和计算方法三十年来的主要进展,并更多地关注早期的发展.本综述主要关注接触模型的几何方面,不涉及与材料相关的... 详细信息

离散元方法(DEM)自1979年提出以来,在过去四十年中取得了显著的发展.本文旨在选择性地概述离散元方法中非球形颗粒接触模型和计算方法三十年来的主要进展,并更多地关注早期的发展.本综述主要关注接触模型的几何方面,不涉及与材料相关的物理问题.首先分类描述了非球形颗粒几何形状的各种表示方案,然后对几乎所有非球形颗粒接触模型和方法进行了系统性地梳理和讨论,除概述这些方法和模型的关键思想、主要概念以及原创性的计算方法外,还详细讨论了它们的演变和相互关系.最后还简要评述了每种方法可能存在的问题和未解决的问题,并指出可能的解决方案.

关键词：离散元方法几何形状接触模型非球形颗粒分类描述计算方法原创性发展概述

Evolutionary mechanism of zeolite monolayer on substrate surface in hydrothermal reaction

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Evolutionary mechanism of zeolite monolayer on substrate sur...

第十五届全国分子筛学术大会

作者： Jerry y.S.Lin Department of Chemical Engineering Arizona State University

＜正＞As advanced functional materials, oriented zeolite thin films and membranes have been applied as separation and catalytic membranes, imaging and data storage media,

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Advanced Method of Tracking Single-Trial Recording of VEP Using Modified RBF Neural Network

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Advanced Method of Tracking Single-Trial Recording of VEP Us...

The Third Asian Conference on Vision (ACV2004)

作者： Francis H.y.Chan Department of Electronics The University of Hong KongHong Kong.

＜正＞ Visual evoked-potential （VEP） is well known in many applications of neuroscience for clinical purposes. Traditional EP estimation based on ensemble averaging （EA） is widely used to extract the EP from noisy background. However, EA fails to track the trial-to-trial variations in both amplitude and latency. To estimate the single-trail VEP, a novel method using normalized radial basis function neural network （NRBFNN） is proposed to estimate the single-trail VEP. NRBFNN approach enables to effectively capture the VEP variations across trials and performs fast VEP measurement in many time-critical circumstances [1,2].

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基于先进控制技术的车辆主动安全领域研究展望(英文)

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汽车安全与节能学报 2010年第1期1卷 14-22页

作者：永井正夫东京农工大学机械系统工程系

基于传感和控制技术,研究了提高车辆主动安全性的技术和方法。介绍了日本交通事故的统计数据,阐述了用于事故、事件调查分析的驾驶记录仪的发展。基于车辆动态数据,提出了驾驶记录仪捕捉未遂事件所用的算法。回顾了提高车辆动力学性能... 详细信息

基于传感和控制技术,研究了提高车辆主动安全性的技术和方法。介绍了日本交通事故的统计数据,阐述了用于事故、事件调查分析的驾驶记录仪的发展。基于车辆动态数据,提出了驾驶记录仪捕捉未遂事件所用的算法。回顾了提高车辆动力学性能和驾驶辅助功能的微型电动车车辆动力学控制问题。介绍了基于轮毂电机的直接横摆力矩控制和主动前轮转向控制算法。介绍了适应驾驶员特性和交通情况的先进驾驶辅助系统。介绍了根据不同驾驶习惯和周围环境自动调整辅助策略的自适应系统,以及一些利用主动交互车辆和模拟驾驶仪进行的实验研究。提出了有关未来车辆控制技术的一些新观点和新挑战。

关键词：主动安全车辆动力学控制驾驶辅助系统

Functioning of Joint-Stock Companies and the Problems of Corporatization in Ukraine

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Functioning of Joint-Stock Companies and the Problems of Cor...

作者： A.Khimchenko y.Antonuk Donetsk National University

The article considers the essence of the categories"corporation","joint-stock company",analyses the main sides of corporatization in Ukraine;the main problems of Ukrainian corporations’activity and their solutions are *** of the *** the world practice the corporative form of ownership and the operation of business as

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Assessment of the Protective Capacity of Vadoze Zone over Aquifer Systems Using Secondary Geoelectrical Parameters: A Case Study of Kaltungo Area North East, Nigeria

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Journal of Environmental & Earth Sciences 2020年第2期2卷 1-11页

作者： E.y.Mbiimbe I.B.Goni J.M.El-Nafaty A.U.yuguda Department of Geology Gombe State University Department of Geology University of Maiduguri

An assessment of the protective capacity of the vadose zone overlyingthe aquifer systems in the Kaltungo area was carried out to determine itsinfluence on groundwater quality. Applying the schlumberger array with amaximum electrode spread AB/2 = 100m through VES, thirty water wellpoints were surveyed using Omega terrameter (PIOSO1) resistivity *** field data was first subjected to manual interpretation through curvemarching and then digitized modeled curves using computer software. Theinterpreted data revealed that the area is characterized by eleven differentcurve types representing three to five geo electrical layers. In order toassess the protective capacity of the vadoze zone over the aquifer systems,the longitudinal conductance (S) and transverse resistance (T) (secondarygeoelectric parameters) were computed from the primary data using theDar Zarouk formula. The values of S obtained range from 0.0018 to 0.4056ohms with a mean value of 0.0135 ohms while the values of T range from0.55 ohms to 1195.68 ohms with a mean value of 39.84 ohms. The valuesof S and T obtained reveal that 90% of probed points has poor protectivecapacity, 10 % has moderate protective capacity and 83 % has hightransmissivity, 17 % has intermediate transmissivity. The T and S values areskewed towards poorly protective capacity thus making groundwater in thearea highly vulnerable to contamination from the surface. To achieve goodgroundwater quality in the area, proper completion of newly constructedwells should install protective casing through the entire vadose zone.

关键词： Assessment Protective Capacity Vadose zone Aquifer systems Secondary Geoelectric Parameters and Kaltungo Area

THEORETICAL CONSIDERATIONS OF SECONDARy ORGANIC AEROSOL FORMATION FROM H-ABSTRACTION REACTION OF P-XyLENE

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THEORETICAL CONSIDERATIONS OF SECONDARY ORGANIC AEROSOL FORM...

中国化学会第27届学术年会

作者：胡淑贤 Eddy y.Zeng State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences

＜正＞Xylenes are important constituents of many liquid fuels, as well as precursors of secondary organic aerosol （SOA）1-2. Theoretical calculations at the B3LyP/6-311++G**level using Gaussian 03 program

关键词： p-Xylene H-Abstraction Channel Theoretical Barrier