全文获取类型
收费全文 | 119篇 |
免费 | 2篇 |
专业分类
教育 | 95篇 |
科学研究 | 13篇 |
各国文化 | 2篇 |
综合类 | 4篇 |
信息传播 | 7篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2017年 | 4篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 11篇 |
2012年 | 17篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 7篇 |
2008年 | 3篇 |
2007年 | 13篇 |
2006年 | 5篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有121条查询结果,搜索用时 31 毫秒
1.
Tao Wang Ying Tong Wenjiao Xiao Lei Guo Brian F.Windley Tatiana Donskaya Shan Li Narantsetseg Tserendash Jianjun Zhang 《国家科学评论(英文版)》2022,9(5):167-178
Tracing the closure of oceans with irregular margins and the formation of an orocline are crucial for understanding plate reconstruction and continental assembly.The eastern Central Asian Orogenic Belt,where the Mongol-Okhotsk orocline is situated,is one of the world’s largest magmatic provinces.Using a large data set of U-Pb zircon ages,we updated the timing of many published igneous rocks,which allowed us to recognize tightly ’folded’ linear Carboniferous-Jurassic magmatic belts that wrap arou... 相似文献
2.
以月季"卡罗拉"为试材,采用不同浓度的脱落酸单剂作为保鲜液,分别对月季"卡罗拉"切花花枝进行保鲜处理,对瓶插寿命、花径改变量、花枝鲜重、叶绿素及花青素等研究其相关形态指标变化,结果表明:天然脱落酸(S-诱抗素)在月季鲜切花保鲜方面的较佳单剂浓度为:1.0 mg/L与2.0 mg/L. 相似文献
3.
4.
Nancy L. Halliday Mary B. Moon Daniel L. O'Donoghue Britta M. Thompson Sheila M. Crow 《Anatomical sciences education》2019,12(4):399-406
The University of Oklahoma College of Medicine has conducted an annual Anatomical Donor Luncheon where families of the anatomical donors met anatomy dissection groups of medical students. The luncheon presented an opportunity for donor family members to share the life story of their loved one with the medical students prior to the start of the anatomy course. This study was designed to understand the impact of the Anatomical Donor Luncheon on families of the donors. Seven families in two different focus groups were included to explore the reactions and attitudes of the donor families to meeting the medical students. Conversations were digitally recorded and transcribed. Qualitative analysis of textual data were coded by three investigators using the Constant Comparative Method. To provide evidence of validity, a form of member checking was utilized. For further triangulation, an analyst not involved in conducting the focus groups or analyzing the data, re-coded all data. This analyst used categories and themes identified by the original analysts, ensuring validity of the themes and any negative cases (data not supporting or contradictory of the established categories and themes). One meta-theme and three sub-themes were identified. The meta-theme was Donor Family Participants Experience Transformation and Closure, and sub-themes were Motivators for Participation, Optimal Venue Factors, and Optimal Medical Student–Anatomical Donor Family Interactions. Study findings indicated the Anatomical Donor Luncheon facilitated closure on the death of their loved one, and transformed their apprehension about the luncheon and body donation into an attitude of gratitude and appreciation. 相似文献
5.
6.
Sue Shepherd 《Perspectives: Policy and Practice in Higher Education》2017,21(4):129-134
Pre-1992 English universities are changing the way they appoint their deputy and pro-vice-chancellors (PVCs). Traditionally, PVC posts were filled by internal secondment from within the professoriate, but these days an increasing number are appointed by means of external open competition involving advertisement and/or executive search. So has this ‘opening up’ of PVC positions created new career progression opportunities for professional services managers? Findings from a census, online survey and interviews with a range of senior university managers suggest not. Despite the PVC role becoming more managerial, those getting the jobs remain overwhelmingly career academics. Professional services managers confront a glass wall, excluded from consideration by a non-negotiable requirement for academic credibility. Aware they have little chance of getting a PVC job, they are unlikely to apply. The continued monopolisation of PVC posts by academic managers represents a form of social closure that serves to maintain their elite status. 相似文献
7.
Xiangjie Kong Mengyi Mao Huizhen Jiang Shuo Yu Liangtian Wan 《Journal of Informetrics》2019,13(3):887-900
Collaboration usually has a positive effect on researchers’ productivity: researchers have become increasingly collaborative, according to recent studies. Numerous studies have focused on enhancing research collaboration by recommendation technology and measuring the influence of researchers. However, few studies have investigated the effect of collaboration on the position of a researcher in the research social network. In this paper, we explore the relationships between collaboration and influence by social analytical methods, which are pertinent to analyzing the network structure and individual traits. We evaluate three aspects of the researchers’ influence: friendship paradox validation, social circle, and structure of a researcher's ego network. Furthermore, the ”six degrees of Bacon number” theory, generalized friendship paradox, and triadic closure theory are introduced to support our analysis. Experimental results show that collaboration can help researchers increase their influence to some extent. 相似文献
8.
David Palfreyman 《Perspectives: Policy and Practice in Higher Education》2013,17(4):138-139
ABSTRACTAs marketisation, stratification and performance measurement besiege Higher Education, managing change becomes a critical leadership and administrative skill. Managing the student experience and organisational reputation take on renewed significance. Yet whilst much attention is paid to quality assurance and validation processes as Higher Education seeks to develop programmes that address stakeholder demands, little work has been done that looks at course closure. It is suggested that fresh perspectives drawn from change communications scholarship, can provide practical value to university leadership teams. In particular, by recognising course closure as a form of trauma, then universities might be better placed to communicate with and support students on closing courses. 相似文献
9.
求解关系的闭包是一个重要的问题,它的求解主要有三种方法,其中包括集合表达式、关系图和矩阵.利用集合表达式和关系图来求解往往很繁琐,利用矩阵求解,效率则会较高,就此问题进行了研究,建立了数学模型,并利用编程使之在计算机上能够操作实现一般求解. 相似文献
10.