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数字图书馆员素质研究 总被引:2,自引:0,他引:2
赵水森 《洛阳师范学院学报》2002,21(6):135-137
数字图书馆员素质是数字图书馆建设和发展的关键因素。数字图书馆员的一般素质、必备 素质、特殊素质三个方面是数字图书馆员素质的基本构成。 相似文献
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This article proposes 2 classes of ridge generalized least squares (GLS) procedures for structural equation modeling (SEM) with unknown population distributions. The weight matrix for the first class of ridge GLS is obtained by combining the sample fourth-order moment matrix with the identity matrix. The weight matrix for the second class is obtained by combining the sample fourth-order moment matrix with its diagonal matrix. Empirical results indicate that, with data from an unknown population distribution, parameter estimates by ridge GLS can be much more accurate than those by either GLS or normal-distribution-based maximum likelihood; and standard errors of the parameter estimates also become more accurate in predicting the empirical ones. Rescaled and adjusted statistics are proposed for overall model evaluation, and they also perform much better than the default statistic following from the GLS method. The use of the ridge GLS procedures is illustrated with a real data set. 相似文献
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本文从鸡舍内部分有害气体的产生和分布 ,有害气体对鸡的健康和生产性能的影响及有害气体的预防与控制等方面的研究现状及发展进行了综合论述。 相似文献
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根据SOHO飞船上的LASCO和EIT探测器和GOES卫星的关于太阳活动的观测资料以及ACE和Wind飞船在地球轨道附近关于太阳风等离子体和行星际磁场的观测数据,分析了日冕物质抛射(CME)、行星际磁云和地磁暴的相关性.包括具有地磁效应的晕状CME的日面源区位置分布,日冕物质抛射的中等周期分析,产生地磁暴的行星际参数的阈值等等.作为行星际复杂抛射的一种,首次提出了多重磁云的概念.通过分析观测事例,总结出了多重磁云的一些观测特征,并认为其具有潜在的强大的地磁效应.此外,利用观测资料,研究了激波进入磁云并引起地磁暴的现象.通过建立简单的理论模型,初步分析了激波在穿越磁云的过程中,所能引起的地磁暴的强度的变化. 相似文献
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Simpson W.L. Wong Him Cheung Mo Zheng Xiujie Yang Catherine McBride Connie Suk-Han Ho Judy Sze-Man Leung Bonnie Wing-Yin Chow Mary Miu Yee Waye 《Child development》2020,91(6):1886-1897
Vocabulary knowledge was tested in a native (Cantonese-Chinese) and foreign (English) language in 150 twins and 150 singletons aged 6–11 years, matched on age, gender, grade level, nonverbal intelligence, parents’ education, family income, and number of siblings and household members. The singletons clearly outperformed the twins on the native vocabulary, but this “twinning effect” was much less noticeable for the foreign vocabulary. The effect on English vocabulary was further reduced after exposure to English at home was controlled. Given that these participants learned most of their English in school rather than home, the present findings support the notion that the twinning effect is associated with increased competition for family interaction in twins compared with singletons. 相似文献
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In this paper, we propose that successful education needs to fulfil three purposes while being cognisant of time and context: (a) learning, (b) lifework and (c) well-being. An education system is successful if it can develop future-ready individuals who will continue to learn beyond graduation, take on future lifework, and thrive in a changing society and environment. The future is context-situated and context-dependent. We have chosen to examine the economic, social and environmental context of Singapore to provide insight on the values, skills and knowledge that are required of future-ready learners according to the three purposes. We have compared the trajectories of other high-income nations with those of Singapore. Traditional teaching and learning practices no longer serve us well in the new realities that emerge. Education practices need to evolve in tandem to meet the demands of the 21st century. The roles that school leaders play include creating teaching and learning environments where these practices can be implemented. In our review of leadership practices and concepts, we have found that it is important for school leaders to question existing assumptions of teaching, learning and leadership practices in order to advance the development of 21st century skills, knowledge, values, and habits in learners. 相似文献