全文获取类型
收费全文 | 2606篇 |
免费 | 51篇 |
国内免费 | 3篇 |
专业分类
教育 | 1838篇 |
科学研究 | 194篇 |
各国文化 | 59篇 |
体育 | 252篇 |
综合类 | 2篇 |
文化理论 | 34篇 |
信息传播 | 281篇 |
出版年
2023年 | 11篇 |
2022年 | 12篇 |
2021年 | 31篇 |
2020年 | 44篇 |
2019年 | 71篇 |
2018年 | 138篇 |
2017年 | 121篇 |
2016年 | 111篇 |
2015年 | 81篇 |
2014年 | 96篇 |
2013年 | 562篇 |
2012年 | 92篇 |
2011年 | 80篇 |
2010年 | 75篇 |
2009年 | 73篇 |
2008年 | 75篇 |
2007年 | 62篇 |
2006年 | 52篇 |
2005年 | 54篇 |
2004年 | 49篇 |
2003年 | 42篇 |
2002年 | 41篇 |
2001年 | 27篇 |
2000年 | 44篇 |
1999年 | 29篇 |
1998年 | 31篇 |
1997年 | 31篇 |
1996年 | 30篇 |
1995年 | 34篇 |
1994年 | 26篇 |
1993年 | 34篇 |
1992年 | 18篇 |
1991年 | 14篇 |
1990年 | 29篇 |
1989年 | 16篇 |
1988年 | 20篇 |
1987年 | 20篇 |
1986年 | 13篇 |
1985年 | 22篇 |
1984年 | 28篇 |
1983年 | 17篇 |
1982年 | 15篇 |
1981年 | 19篇 |
1980年 | 18篇 |
1979年 | 12篇 |
1978年 | 12篇 |
1977年 | 12篇 |
1974年 | 10篇 |
1973年 | 12篇 |
1971年 | 9篇 |
排序方式: 共有2660条查询结果,搜索用时 93 毫秒
1.
Gale Macleod Robin Dallas-Childs Colin Brough Martin Toye 《Journal of Research in Special Educational Needs》2021,21(Z1):25-35
In this article we examine the complex relationship between care experience, mental health and exclusion from school and how young people (YP) negotiate these different experiences and identities. The study is a secondary analysis, informed by symbolic interactionist theory, of interviews conducted with 19 care experienced YP in Scotland. Not all of the YP were excluded and not all had a formal mental health diagnosis, as such our study design allows interrogation of the contexts and relationships which not only facilitate but also disrupt pathways to exclusion. It also allows reconsideration of assumptions of vulnerability which are often applied to care experienced YP. Our findings suggest that these YP are moving beyond ‘role playing’ the identities ascribed to them and actively seek out relationships which enable them to construct alternative identities. 相似文献
2.
Although there has been a great deal of research into Collaborative Information Retrieval (CIR) and Collaborative Information Seeking (CIS), the majority has assumed that team members have the same level of unrestricted access to underlying information. However, observations from different domains (e.g. healthcare, business, etc.) have suggested that collaboration sometimes involves people with differing levels of access to underlying information. This type of scenario has been referred to as Multi-Level Collaborative Information Retrieval (MLCIR). To the best of our knowledge, no studies have been conducted to investigate the effect of awareness, an existing CIR/CIS concept, on MLCIR. To address this gap in current knowledge, we conducted two separate user studies using a total of 5 different collaborative search interfaces and 3 information access scenarios. A number of Information Retrieval (IR), CIS and CIR evaluation metrics, as well as questionnaires were used to compare the interfaces. Design interviews were also conducted after evaluations to obtain qualitative feedback from participants. Results suggested that query properties such as time spent on query, query popularity and query effectiveness could allow users to obtain information about team's search performance and implicitly suggest better queries without disclosing sensitive data. Besides, having access to a history of intersecting viewed, relevant and bookmarked documents could provide similar positive effect as query properties. Also, it was found that being able to easily identify different team members and their actions is important for users in MLCIR. Based on our findings, we provide important design recommendations to help develop new CIR and MLCIR interfaces. 相似文献
3.
Martin R?tteler 《Informatik - Forschung und Entwicklung》2006,55(3):3-20
Quantum algorithms are a field of growing interest within the theoretical computer science as
well as the physics community. Surprisingly, although the number of researchers working on the subject
is ever-increasing, the number of quantum algorithms found so far is quite small. In fact, the task of
designing new quantum algorithms has been proven to be extremely difficult. In this paper we give an overview
of the known quantum algorithms and briefly describe the underlying ideas. Roughly, the algorithms presented
are divided into hidden subgroup type algorithms and in amplitude amplification type algorithms. While
the former deal with problems of group-theoretical nature and have the promise to yield strong separations
of classical and quantum algorithms, the latter have been proved to be a prolific source of algorithms
in which a polynomial speed-up as compared to classical algorithms can be achieved. We also discuss
quantum algorithms which do not fall under these two categories and give a survey of techniques of
general interest in quantum computing such as adiabatic computing, lower bounds for quantum algorithms,
and quantum interactive proofs. 相似文献
4.
5.
Miriam Griffiths 《Higher Education Quarterly》2003,57(4):355-375
In relation to the size of its population, Wales has a relatively large number of higher education institutions, several of which are small and located in rural areas. Compared with other parts of the United Kingdom, only a small number of higher education students are taught in Welsh further education colleges. Nevertheless, efforts have been made to increase higher education provision in the colleges, beginning in the late 1980s with the encouragement of franchising arrangements by the Wales Advisory Body and later with a joint initiative by the Higher and Further Education Funding Councils for Wales to expand some sub‐degree higher education in the colleges by direct funding. These developments represent just one strand of activity linking the higher and further education sectors in Wales and have not been a subject of major or regular policy attention. For reasons of scale and geography, and through the enabling structures and processes serving both funding councils, cross‐sector initiatives and collaboration have generally been given high priority in strategies to widen access and build progression. The administrative devolution reflected in these arrangements has been increased by political devolution since 1999, with as yet unclear implications for the future development of higher education in the colleges. 相似文献
6.
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
7.
Diane M. Martin 《Journal of Applied Communication Research》2004,32(2):147-170
Women in middle management continue to face multiple paradoxes arising from their structural and gendered locations that add to the uncertainty of negotiating organizational life. Investigating the lived experiences of women middle managers can illuminate the constraints and paradoxes endemic to organizing, for such experiences foreground tensions at the intersection of structure, identity, agency, and power. Specifically, this contextual investigation of conversational humor explores links between organizational status, gender, and paradox. In so doing, it demonstrates how women can use humor to negotiate managerial identities and to navigate organizational life. This study uncovers nuanced and important communication tactics of middle management women. This study also reveals the value of investigating the complex convergence of humor, gender, and organizational communication theory. 相似文献
8.
9.
Albert Martin Susanne Bartscher-Finzer Anne Richards 《Publishing Research Quarterly》2018,34(1):69-88
Our study compares the motivations of Australian and German book publishers. The results demonstrate remarkable similarities, but also a significant difference regarding the effects of the publishers’ self-concept. In the German case the publishers with a dominant economic orientation are more proactive than the publishers with a dominant cultural orientation. In the Australian case, this correlation does not exist. The same difference holds for the relationship between the economic orientation and extrinsic motivation. We discuss these results and examine empirical evidence and theoretical suggestions to explain the differing findings. The data stem from surveys conducted in the two countries with responses of 196 (Germany) and 54 publishers (Australia). 相似文献
10.
Elena Rudkowsky Martin Haselmayer Matthias Wastian Marcelo Jenny Štefan Emrich Michael Sedlmair 《Communication methods and measures》2018,12(2-3):140-157
ABSTRACTMoving beyond the dominant bag-of-words approach to sentiment analysis we introduce an alternative procedure based on distributed word embeddings. The strength of word embeddings is the ability to capture similarities in word meaning. We use word embeddings as part of a supervised machine learning procedure which estimates levels of negativity in parliamentary speeches. The procedure’s accuracy is evaluated with crowdcoded training sentences; its external validity through a study of patterns of negativity in Austrian parliamentary speeches. The results show the potential of the word embeddings approach for sentiment analysis in the social sciences. 相似文献