数字目录学--当代目录学的发展方向   总被引：21，自引：1，他引：21  

柯平 《图书情报知识》2005,(3):18-22

本文阐述了衍生于文献目录学的数字目录学建立的意义,分析了数字目录学的基本原理,讨论了数字目录学的三个主要研究领域:数字资源系统的目录学研究、数字参考咨询的目录学研究和数字化学习指导的目录学研究,并提出了21世纪数字目录学建设的一些意见。  相似文献   

Oddy Test Reloaded: Standardized Test Equipment and Evaluation Methods for Accelerated Corrosion Testing     

Hildegard Heine 《文物保护研究》2018,63(5):362-365

  相似文献   

UNIMARC Format Relevance: Maintenance or Replacement?     

Rosa Maria Galvão 《Cataloging & classification quarterly》2018,56(1):62-82

This article presents an empirical study focused on a qualitative analysis of the UNIMARC format. An analysis of the structural quality of the data provided by the format is evaluated to determine its current suitability for meeting the requirements and trends in data architecture for the information network and the Semantic Web. Driven by a set of quality characteristics that identify weaknesses in the data schema that cannot be bridged by simply converting data to MARC XML or RDF/XML, we conclude that the UNIMARC format is not compliant with the current metadata schema desiderata and must be replaced.  相似文献   

关于学习控制的定量分析   总被引：3，自引：0，他引：3  

马武  杜立梅 《电化教育研究》2001,(6)

本文根据著名教育技术学家瑞奇鲁斯 (C .M .Reigeluth)的影响学习控制的主要因素 ,将其进行量化处理 ,并设计出相应的计算公式 ,然后根据学习控制定量分析调查结果 ,计算学习控制的量化数据 ,利用定量分析的方法 ,指导教师制定和实施相应的教学策略。  相似文献   

浅谈巡视在工程监理中的作用     

朱礼俊  黄雄 《长江工程职业技术学院学报》2005,22(1):26-27

从质量、进度和投资三方面论述了监理巡视的作用和重要性.  相似文献   

空气质量响应曲面模型在杭州市的应用     

戴志翔  胡诗玮  罗坤  高翔  樊建人  岑可法 《中国科学院大学学报》2017,34(2):179-185

基于CMAQ模拟结果，统计、归纳出各种污染物排放控制因子与污染物浓度之间的函数关系，建立空气质量响应曲面模型RSM，通过留一法交叉验证和外部验证对模型进行可靠性验证。使用RSM，研究不同污染物的PM_2.5响应值，评估现有政策不变（Ⅰ）和政策收紧（Ⅱ）两种减排情景，发现NO_X、SO₂、NH₃和VOC对PM_2.5浓度体现明显的非线性响应特征，情景Ⅱ的减排效果明显好于情景Ⅰ，夏季的减排效果好于冬季。  相似文献   

增程式混合动力集装箱龙门起重机能量智能控制策略     

刘海威  张敏 《上海海事大学学报》2016,37(2):77-82

针对集装箱龙门起重机的具体工况需求和特点，构建一种适用于集装箱龙门起重机的增程式混合动力系统，提出并分析该动力系统的能量智能控制策略，设计相应的智能控制模型.通过以动力电池组的荷电状态（State Of Charge, SOC）和集装箱龙门起重机运行能量需求为模糊输入，以动力电池组的充电功率为模糊输出，实现了对增程式混合动力系统的智能控制.仿真结果验证了该控制策略和控制模型的可行性和有效性.  相似文献   

Quiet eye training aids the long-term learning of throwing and catching in children: Preliminary evidence for a predictive control strategy     

C. A. L. Miles  S. J. Vine  J. N. Vickers  M. R. Wilson 《European Journal of Sport Science》2017,17(1):100-108

Abstract

Quiet eye training (QET) may be a more effective method for teaching children to catch than traditional training (TT) methods, but it is unclear if the benefits accrued persist in the long term. Thirty children were randomly allocated into a QET or TT group and, while wearing a mobile eye tracker, underwent baseline testing, training and two retention tests over a period of eight weeks, using a validated throw and catch task. During training, movement-related information was provided to both groups, while the QET group received additional instruction to increase the duration of their targeting fixation (QE1) on the wall prior to the throw, and pursuit tracking (QE2) period on the ball prior to catching. In both immediate (R1) and delayed (R2, six weeks later) retention tests, the QET group had a significantly longer QE1 duration and an earlier and longer QE2 duration, compared to the TT group, who revealed no improvements. A performance advantage was also found for the QET compared to the TT group at both R1 and R2, revealing the relatively robust nature of the visuomotor alterations. Regression analyses suggested that only the duration of QE1 predicted variance in catch success post-training, pointing to the importance of a pre-programming visuomotor strategy for successful throw and catch performance.  相似文献   

Performing under pressure: Exploring the psychological state underlying clutch performance in sport     

Christian Swann  Lee Crust  Patricia Jackman  Stewart A. Vella  Mark S. Allen  Richard Keegan 《Journal of sports sciences》2017,35(23):2272-2280

Clutch performance is improved performance under pressure. However, little research has examined the psychological state experienced by athletes in these situations. Therefore, this study qualitatively examined the subjective experience underlying clutch performance across a range of sports (e.g., team, individual) and standards (Olympic to recreational athletes). Sixteen athletes (M_age = 27.08 years; SD = 6.48) took part in in-depth, semi-structured interviews primarily after an exceptional performance (M = 4.38 days later; SD = 3.14). Data were analysed inductively and thematically. Clutch states involved 12 characteristics, including heightened and deliberate concentration, intense effort, and heightened awareness, which distinguished the experience of clutch from other optimal psychological states such as flow. Other characteristics, such as perceptions of control, were also reported and supported previous experimental research on clutch. These findings present in-depth qualitative insights into the psychological state underlying clutch performance, and are discussed in relation to the existing literature on optimal psychological states in sport.  相似文献   

基于VxWorks的微小型AUV体系结构设计     

聂建多  褚振忠  朱大奇 《上海海事大学学报》2016,37(3):90-94

为提高自主式水下机器人(Autonomous Underwater Vehicle,AUV)控制系统的鲁棒性，将分层递阶结构与包容式结构相结合，提出了一种混合式控制体系结构，开发了基于VxWorks的微小型AUV控制系统.该系统以“海事金枪鱼”号AUV为载体，以嵌入式PC104计算机为系统核心,通过传感器的信息融合、算法实现和多任务运行，控制系统驱动推进器、舵、翼等执行单元实现AUV的姿态调整、导航和路径规划，最终达到自主作业的目的.“海事金枪鱼”号AUV的开发应用，验证了方案的可行性以及控制系统的可靠性和稳定性.  相似文献