全文获取类型
收费全文 | 1598篇 |
免费 | 28篇 |
国内免费 | 3篇 |
专业分类
教育 | 1152篇 |
科学研究 | 101篇 |
各国文化 | 24篇 |
体育 | 139篇 |
文化理论 | 26篇 |
信息传播 | 187篇 |
出版年
2023年 | 9篇 |
2022年 | 17篇 |
2021年 | 26篇 |
2020年 | 24篇 |
2019年 | 55篇 |
2018年 | 66篇 |
2017年 | 70篇 |
2016年 | 63篇 |
2015年 | 41篇 |
2014年 | 53篇 |
2013年 | 322篇 |
2012年 | 50篇 |
2011年 | 48篇 |
2010年 | 52篇 |
2009年 | 43篇 |
2008年 | 43篇 |
2007年 | 64篇 |
2006年 | 42篇 |
2005年 | 44篇 |
2004年 | 36篇 |
2003年 | 42篇 |
2002年 | 31篇 |
2001年 | 28篇 |
2000年 | 18篇 |
1999年 | 19篇 |
1998年 | 20篇 |
1997年 | 7篇 |
1996年 | 14篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1993年 | 12篇 |
1992年 | 11篇 |
1991年 | 10篇 |
1989年 | 9篇 |
1988年 | 7篇 |
1987年 | 16篇 |
1985年 | 13篇 |
1984年 | 7篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 10篇 |
1978年 | 8篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 7篇 |
1971年 | 11篇 |
1969年 | 6篇 |
排序方式: 共有1629条查询结果,搜索用时 15 毫秒
31.
The predictive value of rime spellings in English was compared directly to other types of regularities beyond the level of the single letter. A computer-assisted analysis of a list of twenty-four thousand written words, each paired with its corresponding pronunciation, reveals that only a small number of rime spellings are highly regular in their pronunciations. The conventional division of vowel letter pronunciations into short and long in closed and open written syllables is the most reliable key to English pronunciation. Our findings support the notion that English spelling is based at least in part on syllable structure. In addition, prefixes and suffixes provide very reliable clues to pronunciation, which suggests that their regularity should be exploited in the teaching of reading. 相似文献
32.
Eric Von Hippel 《Research Policy》1982,11(2):95-115
It has been empirically observed that, in some industries product users are the most frequent sources of product innovations while, in other industries, product manufacturers are. I hypothesize that such differences are caused by differences in the ability of these two “functional” categories of innovators to appropriate innovation benefit. I explore this hypothesis by examining the real-world effectiveness of mechanisms (such as patents and lead time) used for the appropriation of innovation benefit and the dependence of this effectiveness on the functional relationship between innovator and innovation. 相似文献
33.
Relative efficiency of R&D activities: A cross-country study accounting for environmental factors in the DEA approach 总被引:1,自引:0,他引:1
This paper applies the production framework associated with the data envelopment analysis (DEA) method to evaluate the relative efficiency of R&D activities across countries. R&D capital stocks and manpower are treated as inputs while patents and academic publications are considered as outputs. A three-stage approach, which involves using DEA for evaluating efficiency and using Tobit regressions for controlling the external environment, is applied to 30 countries in recent years. The results show that less than one-half of the countries are fully efficient in R&D activities and that more than two-thirds are at the stage of increasing returns to scale. Most countries have a more significant advantage in producing SCI cum EI publications than in generating patents. 相似文献
34.
Marital conflict and conduct problems in Children of Twins 总被引:3,自引:0,他引:3
Harden KP Turkheimer E Emery RE D'Onofrio BM Slutske WS Heath AC Martin NG 《Child development》2007,78(1):1-18
The Children-of-Twins design was used to test whether associations between marital conflict frequency and conduct problems can be replicated within the children of discordant twin pairs. A sample of 2,051 children (age 14-39 years) of 1,045 twins was used to estimate the genetic and environmental influences on marital conflict and determine whether genetic or environmental selection processes underlie the observed association between marital conflict and conduct problems. Results indicate that genetic and nonshared environmental factors influence the risk of marital conflict. Furthermore, genetic influences mediated the association between marital conflict frequency and conduct problems. These results highlight the need for quasiexperimental designs in investigations of intergenerational associations. 相似文献
35.
Prevalence of child sexual abuse reported by a cross-sectional sample of New Zealand women 总被引:1,自引:0,他引:1
OBJECTIVE: The objective is to describe the prevalence of child sexual abuse (CSA) among women in New Zealand, document ethnic specific rates, and outline the frequency of abuse experienced and the most commonly identified perpetrators. Associations between CSA and later adverse consequences were also explored. METHODS: Retrospective report from a random sample of 2,855 women aged 18-64 years old in two regions in New Zealand. Face-to-face interviews with one randomly selected woman from each household were conducted. RESULTS: The overall prevalence rates for CSA were 23.5% for women from the urban region and 28.2% from the rural region. In both urban and rural regions, Māori women more frequently reported experiences of CSA than women from European and other ethnic groups (urban: 30.5% vs. 17.0% and rural: 35.1% vs. 20.7%). The median age of onset of the abuse was 9 years, and the median estimated age of the abuser was 30 years. Half of those who experienced CSA reported that it occurred once or twice, 27% "a few times," and 23% "multiple times." Sole perpetrators were involved in 83% of cases. The majority of cases were perpetrated by a family member, most frequently male. Compared with non-victims, victims of CSA were twice as likely to experience later intimate partner violence and violence by others. CONCLUSIONS: This study reports on a large, population-based sample in an ethnically diverse population in New Zealand, providing the first ethnic-specific rates of CSA available. Findings suggest important priorities for prevention and intervention activities. 相似文献
36.
Robinson Clinton Vũ Tú Anh Thị 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2019,65(3):443-470
International Review of Education - In the multilingual environments of Africa, national literacy policies vary in terms of the attention they give to the roles and purposes of local, national and... 相似文献
37.
Yvonne Robinson Anna Paraskevopoulou Sumi Hollingworth 《British Educational Research Journal》2019,45(6):1203-1219
Creativity has become the new watchword in UK academic and policy circles. Within this context, policy discussions about the arts and their impact emphasise economic benefits over educational value, drawing clear distinctions between quantifiable or ‘hard’ measures of impact and those described as ‘soft’, less tangible and lacking a strong evidence base. Departing from the binary logics often underpinning notions of arts impacts, this article is novel in exploring the entwined relationship between impacts seen as ‘hard’ and ‘soft’. We draw on research examining the links between arts education and young people's future trajectories and use the concept of ‘active citizenship’ to show how informal, softer skills fostered through creative learning are an important part of citizenship-making for some young people. Participants’ accounts show how improvements in soft skills can give young people opportunities for agency, which shape progression pathways leading to measurable change. This finding is directly relevant in the context of evaluations of arts impacts in the UK and abroad, and should encourage further examination of the impact of creative learning on transfer of skills as well as policy developments in this area. 相似文献
38.
39.
40.