基于公共描述框架的文献采集指标体系用户准则分解     

周群芳  罗志尧 《情报杂志》2007,26(6):124-127

文献选择是文献采集的核心，文献选择的基本原理是在成本相同的情况下，优先选择概率使用价值大的文献。文献的概率使用价值运用层次分析法分解后，需要一个相应的描述空间来实现，即公共描述框架。公共描述框架是一个文献集的学科等级结构框架，文献采集指标体系中与用户有关的准则可以基于这个框架加以分解。  相似文献   

Complementary and alternative therapies          下载免费PDF全文

Moore ML 《The Journal of perinatal education》2002,11(1):39-42

Complementary and alternative therapies are increasingly used by many pregnant women in the United States; however, limited research is available on many therapies. The number of studies should increase with the establishment of the National Center for Complementary and Alternative Medicine by the National Institutes of Health. This column reviews recent studies of both herbal medicines and alternative therapies used in pregnancy.  相似文献   

对非计算机专业计算机基础教学的思考   总被引：1，自引：0，他引：1  

娄凤伟 《教学研究(河北)》2002,25(2):168-169,172

计算机基础教学的目的是培养学生应用计算机知识解决问题的能力。作者从教学的系统性出发提出燕山大学应开设第三个层次教育，并从问题入手激发学生的学习兴趣和动力。教学实践证明是切实可行和有效的。  相似文献   

例析引导学生深度学习的生物学教学策略     

娄志义 《中学生物学》2021,(2):78-80

深度学习是一种基于高阶思维发展的理解性学习,指学生在主动加工、深度理解的基础上,能够批判性地学习新知识,并将它们融入原有的认知结构中,经过高水平思维过程,灵活运用所学知识和能力,解决实际问题的一种学习方式。新课程改革强调学科核心素养的培养,其中培养学生科学思维是重要内容,而高阶思维的培养更是关键,因此有必要研究指向深度学习的教学策略,以通过促进学生的深度思维加工,从而培养学科核心素养。同时,生物学科的自然科学属性也要求教师在教学中必然渗透深度学习。那么,如何在生物学教学中促进学生深度学习?  相似文献   

合成生物与生物安全          下载免费PDF全文

马延和  江会锋  娄春波  刘君  付钰  王钦宏  李寅 《中国科学院院刊》2016,31(4):432-438

合成生物学基于生物、化学、物理、计算、工程等多学科交叉,对生物体以工程化的方式重新设计甚至是从头合成,将克服自然进化的局限,创造超越自然生命能力的合成生物,不仅对探索生命活动基本规律具有重要科学意义,也在工农业生产、环境保护、健康保健等领域具有巨大应用前景。随着合成生物技术发展的日新月异,合成生物的应用范围日益广泛,如何保障合成生物的生物安全性成为一个极其重要并且亟待解决的关键问题。合成生物学研究中大量涉及来自于病毒、致病性细菌和真菌的强毒力基因元器件,且被设计和使用的毒性基因元件和调控元件的数目也从少数几个跃升为几十个、上百个,乃至整个基因组的重新设计和编辑改造。如果缺乏有效管控或被恶意谬用,这些人工合成生物体可能会对生态环境平衡、公共卫生安全乃至国家国防安全造成威胁。因此,在人工设计和改造生物体的过程中,必须建立系统的防范和监控体系,设计有效的方法和技术来阻止人工生命体在野外环境下的复制和增殖、遗传信息的漂移以及阻断其进化出新的环境适应性,做到完全的人工改造生物隔离,达到真正的人工可控生命目标,确保其生物安全性。文章综述了合成生物学的研究进展和合成生物潜在的生物安全性威胁,以及合成生物的生物安全性防控设计策略,并对相关安全政策规章的制定给出了建议。  相似文献   

基于ISM-Fuzzy AHP的我国中小企业核心竞争力要素分析   总被引：5，自引：0，他引：5  

楼迎军  荣先恒 《科研管理》2007,28(1):97-103

本文首先基于已有研究及调研结果,采用主成分分析法选出7个核心竞争力要素,并以苏州、杭州中小企业为例,通过问卷调查获取数据,并运用ISM-Fuzzy AHP模型分析法对中小企业核心竞争力要素进行实证研究。分析表明,我国企业已日益重视对人力资源、技术创新、市场营销、组织管理能力等核心竞争力要素的培育,但对企业文化的塑造仍不够重视。  相似文献   

Sensory exotropia subsequent to senile cataract     

楼定华  许叶圣  李毓敏 《Journal of Zhejiang University. Science. B》2005,6(12):1220-1222

INTRODUCTION Sensory exotropia is a condition of unilateral divergence as a sequela to loss of vision or long-standing poor vision in one eye,which was caused by refractive errors,unilateral aphakia or other organic reasons.Convergence insufficiency or disruption is possible.The most important aspect of the manage-ment is to find and/or eliminate and/or reverse a treatable cause of the exotropia.In clinic,the sensory exotropia secondary to senile cataract was often ob-served.Prospectively…  相似文献   

情境认知视野中的学习观及其教学模式   总被引：4，自引：0，他引：4  

张伟胜  楼广赤 《现代远程教育研究》2006,(5):50-52

教育者所具有的学习观和知识观会对他们采用什么样的教学方法产生决定性的影响。本文从知识观和学习观的角度对情境认知作了理论梳理,阐明了该理论中知识和学习所具有的特性,并阐释了与之内接的三种教学模式:抛锚式教学,随机进入教学,认知学徒制教学。  相似文献   

A methodological morass? How we can improve quantitative research in distance education     

Robert Bernard  Philip Abrami  Yiping Lou  Evgueni Borokhovski 《Distance Education》2004,25(2):175-198

This article is about the quantitative research practices and methodologies that are used in distance education (DE). It begins with an analysis and assessment of a segment of the DE research literature, DE/classroom comparison studies, based on a recently completed meta-analysis of that literature from 1985 to 2002. Overall, the 232 studies reviewed were judged to be of poor methodological quality and severely lacking in critical information about research practices. Studies of synchronous and asynchronous DE are discussed separately and recommendations are made for improving designs and measures within these patterns. Suggestions for future quantitative research areas are provided. In discussing these findings, we recognize that high-quality research is being conducted in the field and that qualitative forms of research contribute greatly to the mosaic of evidence that is the base of available knowledge about DE. Finally, three organizations, the What Works Clearinghouse (USA), EPPI-Centre (UK), and the Campbell Collaboration (international), all devoted to improving the quality of research and research synthesis in education, are described briefly; suggestions are made as to how their philosophies and approaches for judging the worthiness of research evidence can be used to improve DE research.  相似文献   

Schools as knowledge work organizations: Perspectives and implications from the new management literature     

Betty Lou Whitford  Ric A. Hovda 《The Urban Review》1986,18(1):52-70

The authors argue that the knowledge work metaphor is the most powerful image of schools for understanding reform. Using themes from the new management literature, such as shared decision making, collegiality, innovation, and experimentation, as additional guides for school improvement, the authors develop a case for systemic reform based on the professionalization of teaching and the integration of theory, research, and practice, Finally, transformational leadership is presented as the key to facilitating systemic reform.  相似文献