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91.
邓勤 《阿坝师范高等专科学校学报》2005,22(3):99-101
系统工程技术是研究领域的一个热门课题,它的应用很广。文章指出了系统工程技术的部分功能,并对基于马尔可夫过程的N个不同部件并联可修系统的可用度进行了详细的分析,得出了一般关系式。且举了一个应用实例,其分析结果和思想同样适用于N个相同部件串联及相同部件并联可修系统的可用度分析。 相似文献
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We conducted two experiments to analyze how text availability and question format affect readers’ processes and performance on measures of expository text reading comprehension. Junior high school students read expository texts and answered both multiple choice and open-ended questions on a computer that recorded reading times and readers’ actions with Read&Answer software. The results showed that readers reread prior text segments during initial reading of the text more often when they knew that the text would be unavailable when answering questions than when they knew that the text would be available. In addition, readers made more search decisions in the text- available condition when answering open-ended questions than when answering multiple-choice questions. Regarding performance, we repeatedly found an interaction effect between availability and question format: text availability benefited the open-ended but not the multiple-choice format. We concluded that the two availability conditions are useful in assessing different discourse processes. We discuss theoretical and practical implications for the development of models of reading and new ways to assess reading literacy skills that emphasize purposeful reading. 相似文献
94.
本文介绍了有关群集的基本概念与原理、群集的类型与结构、群集的关键技术等。运用群集来规划图书馆网络,通过服务器提供的冗余设计来避免可用性中断,从而大大提高了图书馆网络系统的可用性。 相似文献
95.
馆藏资源可获得性感知调研及其机理分析 总被引:1,自引:0,他引:1
[目的/意义]为提高读者对馆藏资源可获得性感知的程度,设计5级里克特量表,以探寻可获得性感知的影响因素、影响机理及影响因素间的内在关联性.[方法/过程]采用等比例分层抽样方法获得282份有效问卷,对问卷数据进行数据挖掘和回归分析.[结果/结论]分析结果表明,馆藏资源可获得性感知水平与读者对图书馆的宣传、培训和馆藏资源这三者的满意度都分别有显著的正相关关系,宣传的满意度对可获得性感知的影响最为重要,宣传、培训和馆藏资源的满意度两两之间对馆藏资源可获得性感知都分别有相互促进的交互效应.这些分析结果为提高读者的感知程度,提供了充分的科学依据. 相似文献
96.
知识获取性视角下隐性知识的转化和流动 总被引:1,自引:0,他引:1
南旭光 《科学学与科学技术管理》2010,31(3)
隐性知识在现代知识管理实践中被认为是最有价值的战略性资源,是决定企业技术创新能力高低的根本原因。为了研究隐性知识转移和溢出的交流机制,基于知识获取性的视角提出了一个知识转化途径的概念性模型,并在知识所有者意愿性或非意愿性交流知识的基础上,区分了知识转移和知识溢出模式,提出了个体之间、组织之间、区域之间三个层面的知识流转。 相似文献
97.
Mary A. Burston 《Journal of Further & Higher Education》2017,41(4):516-529
Research suggests that working while studying may compromise academic performance although findings vary when determining if time management or time availability is more influential. A pilot study into time availability for study was undertaken with a sample of pre-service graduates undertaking a teacher preparation course at an Australian university. By adapting Vickery’s time poverty formula, a time deficit was found between recommended study time and expended time commitments. Pre-service teacher entrants worked an average of 18 hours per week, which was greater than the recommended hours of instruction. A negative imbalance between work and study hours may influence how working students achieve skills, competence and knowledge required for the profession of teaching. 相似文献
98.
The Hong Kong Observatory (HKO) provides low-level turbulence alerting service for the Hong Kong International Airport (HKIA) through the windshear and turbulence warning system (WTWS). In the WTWS, turbulence intensities along the flight paths of the airport are estimated based upon correlation equations established between the surface anemometer data and the turbulence data from research aircraft before the opening of the airport. The research aircraft data are not available on day-to-day basis. The remote sensing meteorological instruments, such as the Doppler light detection and ranging (LIDAR) and radar, may be used to provide direct measurements of turbulence intensities over the runway corridors. The performances of LIDAR- and radar-based turbulence intensity data are studied in this paper based on actual turbulence intensity measurements made on 423 commercial jets for a typical case of terrain-induced turbulence in association with a typhoon. It turns out that, with the tuning of the relative operating characteristic (ROC) curve between hit rate and false alarm rate, the LIDAR-based turbulence intensity measurement performs better than the anemometer-based estimation of WTWS for turbulence intensity at moderate level or above. On the other hand, the radar-based measurement does not perform as well when compared with WTWS. By combining LIDAR- and radar-based measurements, the performance is slightly better than WTWS, mainly as a result of contribution from LIDAR-based measurement. As a result, the LIDAR-based turbulence intensity measurement could be used to replace anemometer-based estimate for non-rainy weather conditions. Further enhancements of radar-based turbulence intensity measurement in rain would be necessary. 相似文献
99.
This study looked at the degree to which the online availability of U.S. Geological Survey historical topographic maps affects academic libraries' decisions to withdraw the print versions of those maps. Other factors in making the decisions, such as usage, user preferences, support of academic programs, user discovery, shelving location, and printing options, were also investigated. Results show that while in 40% of the cases the online USGS historical topographic maps influenced the decision to weed, the need for space was the overwhelming driver of print USGS topographic map collection weeding within the past ten years. 相似文献
100.