全文获取类型
收费全文 | 1882篇 |
免费 | 51篇 |
专业分类
教育 | 1567篇 |
科学研究 | 67篇 |
各国文化 | 44篇 |
体育 | 80篇 |
综合类 | 3篇 |
文化理论 | 14篇 |
信息传播 | 158篇 |
出版年
2023年 | 11篇 |
2022年 | 11篇 |
2021年 | 25篇 |
2020年 | 36篇 |
2019年 | 51篇 |
2018年 | 82篇 |
2017年 | 87篇 |
2016年 | 80篇 |
2015年 | 47篇 |
2014年 | 64篇 |
2013年 | 489篇 |
2012年 | 62篇 |
2011年 | 51篇 |
2010年 | 43篇 |
2009年 | 45篇 |
2008年 | 55篇 |
2007年 | 46篇 |
2006年 | 44篇 |
2005年 | 56篇 |
2004年 | 45篇 |
2003年 | 28篇 |
2002年 | 38篇 |
2001年 | 24篇 |
2000年 | 19篇 |
1999年 | 23篇 |
1998年 | 17篇 |
1997年 | 17篇 |
1996年 | 24篇 |
1995年 | 24篇 |
1994年 | 10篇 |
1993年 | 18篇 |
1992年 | 14篇 |
1991年 | 21篇 |
1990年 | 16篇 |
1989年 | 22篇 |
1988年 | 21篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 15篇 |
1983年 | 7篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 11篇 |
1979年 | 8篇 |
1978年 | 18篇 |
1977年 | 9篇 |
1976年 | 8篇 |
1975年 | 10篇 |
1974年 | 7篇 |
排序方式: 共有1933条查询结果,搜索用时 125 毫秒
1.
In this paper, the authors discuss their grounded research carried out with teachers about the wellbeing of teachers. They explore the importance of making the concept of wellbeing more intimate and consider hedonic and eudaimonic ways of looking at wellbeing. They present a model of layered reflection which illuminates key factors that have an impact on the wellbeing of teachers. 相似文献
2.
3.
Mike Cass Dennis Cates Michelle Smith Cynthia Jackson 《Learning disabilities research & practice》2003,18(2):112-120
Abstract. A multiple baseline design was employed to test the effect of manipulative instruction on the perimeter and area problem‐solving performance of middle and high school students who had been diagnosed with LD in the area of mathematics. Modeling, prompting/guided practice, and independent practice in conjunction with manipulative training were employed to teach both perimeter and area problem‐solving skills. Analysis of data revealed that the students rapidly acquired the problem‐solving‐skills, maintained these skills over a two‐month period, and transferred these skills to a paper and pencil problem‐solving format. This research extends previous findings by revealing that use of concrete manipulatives promotes the long‐term maintenance of skills. 相似文献
4.
5.
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
6.
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
7.
8.
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
9.
Zhao RL Desjardin DE Soytong K Hyde KD 《Journal of Zhejiang University. Science. B》2008,9(10):779-786
We present an overview of previous research results on the molecular phylogenetic analyses in Agaricales and its higher ranks (Agaricomycetes/Agaricomycotina/Basidiomycota) along with the most recent treatments of taxonomic systems in these taxa. Establishing phylogenetic hypotheses using DNA sequences, from which an understanding of the natural evolutionary relationships amongst clades may be derived, requires a robust dataset. It has been recognized that single-gene phylogenies may not truly represent organismal phylogenies, but the concordant phylogenetic genealogies from multiple-gene datasets can resolve this problem. The genes commonly used in mushroom phylogenetic research are summarized. 相似文献
10.
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