全文获取类型
收费全文 | 2150篇 |
免费 | 58篇 |
专业分类
教育 | 1766篇 |
科学研究 | 61篇 |
各国文化 | 37篇 |
体育 | 118篇 |
综合类 | 3篇 |
文化理论 | 14篇 |
信息传播 | 209篇 |
出版年
2023年 | 16篇 |
2022年 | 23篇 |
2021年 | 35篇 |
2020年 | 61篇 |
2019年 | 77篇 |
2018年 | 127篇 |
2017年 | 128篇 |
2016年 | 128篇 |
2015年 | 67篇 |
2014年 | 77篇 |
2013年 | 569篇 |
2012年 | 65篇 |
2011年 | 63篇 |
2010年 | 46篇 |
2009年 | 51篇 |
2008年 | 62篇 |
2007年 | 55篇 |
2006年 | 41篇 |
2005年 | 41篇 |
2004年 | 35篇 |
2003年 | 27篇 |
2002年 | 31篇 |
2001年 | 36篇 |
2000年 | 29篇 |
1999年 | 20篇 |
1998年 | 23篇 |
1997年 | 15篇 |
1996年 | 23篇 |
1995年 | 18篇 |
1994年 | 12篇 |
1993年 | 11篇 |
1992年 | 11篇 |
1991年 | 17篇 |
1990年 | 11篇 |
1989年 | 15篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 12篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 9篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 4篇 |
1971年 | 6篇 |
1968年 | 4篇 |
排序方式: 共有2208条查询结果,搜索用时 15 毫秒
1.
2.
Helen Connor 《Higher Education Quarterly》2001,55(2):204-224
The main concern of this paper is the decision making of young people from lower social class backgrounds about whether or not to participate in higher education. In the light of recent reforms of student funding and renewed efforts to widen participation in British higher education, an examination is made of the factors influencing the choices made by young people close to the time of making application for entry. Drawing on the findings of a research study undertaken in 2000 and conducted with recent and prospective undergraduate entrants, a contemporary perspective is offered on the issues facing different groups of young people from disadvantaged backgrounds. By way of conclusion, consideration is given to the need for improved information sources to guide young people in their decisions. 相似文献
3.
An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay. 相似文献
4.
5.
The paper examines e-government development in Africa. This study is based on the Cape Gateway project in South Africa, a leading e-government initiative on the continent. We observe that African countries have jumped on the e-government band wagon by looking mostly at the benefits without a clear risk assessment. We argue that African countries should question the pace and pathway for their e-government programs. We caution that e-government models from developed countries do not necessarily work in Africa. E-government programs in Africa should be balanced with the provision of basic needs and infrastructure. We conclude that e-government in South Africa should adopt multi-cultural approaches, and must be underpinned by national development priorities. We recommend that the Cape Gateway must address the socio-economic context and needs of the country. The pace and pathway of its e-government must depend on the availability of both financial and human resources and also user satisfaction. 相似文献
6.
Susan J. Gardner John Eric Juricek F. Grace Xu 《The Journal of Academic Librarianship》2008,34(1):16-24
Web sites are increasingly used by academic libraries to promote key services and collections to teaching faculty. This study analyzes the content, location, language, and technological features of fifty-four academic library Web pages designed especially for faculty to expose patterns in the development of these pages. 相似文献
7.
Thanh Tin Tang Nick Craswell David Hawking Kathy Griffiths Helen Christensen 《Information Retrieval》2006,9(2):207-225
When searching for health information, results quality can be judged against available scientific evidence: Do search engines return advice consistent with evidence based medicine? We compared the performance of domain-specific health and depression search engines against a general-purpose engine (Google) on both relevance of results and quality of advice. Over 101 queries, to which the term ‘depression’ was added if not already present, Google returned more relevant results than those of the domain-specific engines. However, over the 50 treatment-related queries, Google returned 70 pages recommending for or against a well studied treatment, of which 19 strongly disagreed with the scientific evidence. A domain-specific index of 4 sites selected by domain experts was only wrong in 5 of 50 recommendations. Analysis suggests a tension between relevance and quality. Indexing more pages can give a greater number of relevant results, but selective inclusion can give better quality. 相似文献
8.
Grace Y T Cheng 《Journal of the Medical Library Association》2004,92(4):445-458
OBJECTIVE: This article presents the results of complementary research studies on the behaviors of hospital clinicians in asking clinical questions and the relationship between asking of questions, outcome of information searches, and success in problem solving. METHODS: Triangulation in research methods--a combination of mailed questionnaires, interviews, and a randomized controlled study--was employed to provide complementary views of the research problems under study. RESULTS: The survey and interviews found that clinical problems (concerned mainly with therapy and equipment or technology) were expressed as statements rather than questions (average number of concepts = 1.7), that only slightly more than half (higher for doctors) of problems could be solved, and that the majority of clinical questions were not well formed. An educational workshop however improved clinicians' formulation of questions, but the use of structured prompting was found to improve building of hypotheses in the doctors' group without training. The workshop also improved satisfaction with the obtained information and success in problem solving. Nonetheless, for both the experimental and control groups, more structured and complete questions or statements did not mean higher success rates in problem solving or higher satisfaction with obtained information. CONCLUSION: The triangulation methods have gathered complementary evidence to reject the hypothesis that building well-structured clinical questions would mean higher satisfaction with obtained information and higher success in problem solving. 相似文献
9.
The views of specialists (academics, librarians, publishers and information scientists) on trends in scholarly communications were canvassed by means of structured questions. A greater commonality of views was found than might have been expected. 相似文献
10.