全文获取类型
收费全文 | 1518篇 |
免费 | 30篇 |
专业分类
教育 | 1239篇 |
科学研究 | 28篇 |
各国文化 | 32篇 |
体育 | 58篇 |
综合类 | 1篇 |
文化理论 | 6篇 |
信息传播 | 184篇 |
出版年
2023年 | 7篇 |
2021年 | 17篇 |
2020年 | 20篇 |
2019年 | 47篇 |
2018年 | 59篇 |
2017年 | 70篇 |
2016年 | 49篇 |
2015年 | 35篇 |
2014年 | 50篇 |
2013年 | 384篇 |
2012年 | 41篇 |
2011年 | 34篇 |
2010年 | 45篇 |
2009年 | 43篇 |
2008年 | 45篇 |
2007年 | 35篇 |
2006年 | 26篇 |
2005年 | 35篇 |
2004年 | 39篇 |
2003年 | 27篇 |
2002年 | 24篇 |
2001年 | 24篇 |
2000年 | 21篇 |
1999年 | 17篇 |
1998年 | 10篇 |
1997年 | 22篇 |
1996年 | 16篇 |
1995年 | 20篇 |
1994年 | 18篇 |
1993年 | 19篇 |
1992年 | 10篇 |
1991年 | 19篇 |
1990年 | 15篇 |
1989年 | 12篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1984年 | 21篇 |
1983年 | 11篇 |
1982年 | 14篇 |
1981年 | 12篇 |
1980年 | 14篇 |
1979年 | 9篇 |
1978年 | 6篇 |
1977年 | 10篇 |
1976年 | 10篇 |
1975年 | 8篇 |
1974年 | 13篇 |
1973年 | 7篇 |
排序方式: 共有1548条查询结果,搜索用时 15 毫秒
81.
Education and Information Technologies - 3D printing is an emerging educational technology that is said to prepare learners for a more technologically designed world. In this review, 3D printing... 相似文献
82.
Ann Bailey James Funk David Lessley Chris Sherwood Jeff Crandall William Neale 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(5):678-700
ABSTRACT Professional American football games are recorded in digital video with multiple cameras, often at high resolution and high frame rates. The purpose of this study was to evaluate the accuracy of a videogrammetry technique to calculate translational and rotational helmet velocity before, during and after a helmet impact. In total, 10 football impacts were staged in a National Football League (NFL) stadium by propelling helmeted 50th percentile male crash test dummies into each other or the ground at speeds and orientations representative of concussive impacts for NFL players. The tests were recorded by experienced sports film crews to obtain video coverage and quality typically available for NFL games. A videogrammetry procedure was used to track the position and rotation of the helmet throughout the relevant time interval of the head impact. Compared with rigidly mounted retroreflective marker three dimensional (3-D) motion tracking that was concurrently collected in the experiments, videogrammetry accurately calculated changes in translational and rotational velocity of the helmet using high frame rate (two cameras at 240 Hz) video (7% and 15% error, respectively). Low frame rate (2 cameras at 60 Hz) video was adequate for calculating pre-impact translational velocity but not for calculating the translational or rotational velocity change of the helmet during impact. 相似文献
83.
84.
Ann Bennington 《中学生博览》2011,(7):65-68
你是爱,是暖,是希望,你是人间四月天
那些隐匿在黑暗中的云朵瞬间把太阳遮蔽,阳光从云朵里投射出来,映出云朵的轮廓,像一个模糊的幻境。云朵蘸满了墨水一样沉甸甸地粘在暗色的苍穹,欲来的雨云塞满了曾经湛蓝的天空。然后,雨水铺天盖地而来。 相似文献
85.
Ann Lewis 《British Journal of Special Education》2004,31(1):3-9
The Gulliford Lecture 2003 was given by Professor Ann Lewis of the School of Education at the University of Birmingham. Professor Lewis's lecture, on which this article is based, focused on the process of listening to the views of children and, in particular, children with learning difficulties. Following the near-universal ratification of the United Nations (UN) Convention on the Rights of the Child, a plethora of recent initiatives, both in the UK and internationally, has encouraged professionals to access children's views about provision (educational, health-related, social and legal). A range of materials has been developed to support this process, often by, or in liaison with, children's charities. At the same time, research provides valuable insights into effective practice in exploring the views of children with learning difficulties. In this article, Ann Lewis reviews ten strategies for gathering the views of children and raises four challenges for the further development of policy and practice. She closes her argument with a call for greater rigour and critical evaluation in this crucial and demanding area. 相似文献
86.
Ann Trousdale 《Children‘s Literature in Education》1989,20(2):69-79
Ann Trousdale is an assistant professor at Northern Illinois University, where she teaches courses in children's literature, language arts, language acquisition and development, and storytelling. 相似文献
87.
Ann Gath 《International Journal of Disability, Development & Education》1993,40(3):167-174
The effect on families and the changes that occur in relation to a child with disability or independently are considered through the life span. The recent advances in prenatal screening, special care baby units and genetic counselling may increase fear of disability and have not decreased the incidence. As the rest of the family grow older, the disabled child goes through school years, faces adult life, often with disappointments, and remains having special needs and specific vulnerability until old age. 相似文献
88.
This study employed a four-fold typology of opinion groups depictingthe relationships between minoritymajority status andaccurateinaccurate perception of the climate of opinionabout the 1990 prediction of a destructive earthquake for themid-United States New Madrid Seismic Zone. Data were collectedfrom 629 residents of the area where the earthquake was predictedto occur. Two frameworks were employed to define the climateof opinion to take into account two key variables that influencepublic response to earthquake predictions: the predication'sbelievability and its importance. Accurate perceptions of theclimate of opinion were differntiated from inaccurate perceptionsbased on more frequent media use and the confidence respondentsfelt about protecting themselves from potential earthquake damages.Inaccurate perceptions of the climate of opinion are differentiatednot by more extensive media use and discussions, but by thecrediability placed on the information from the news media anddiscussions, as well as the perceived influence of these informationsources. 相似文献
89.
The disruption of the biological family unit due to divorce or separation followed by remarriage or re-partnering has a profound impact on every family member, including extended family members. An individual becomes a stepgrandparent through later life re-partnering, when an adult child becomes a stepparent, or when a stepchild becomes a parent. In order to gain a greater understanding of the communication influencing the development and maintenance of stepgrandparent roles and identity, a qualitative interpretive analysis method was employed as a guide for interviews with 41 adult stepfamily members across two generations of stepfamily membership: stepparents and stepgrandparents. 相似文献
90.
Performance management systems have been an inevitable consequence of the development of government research evaluations (GREs) of university research, and have also inevitably affected the working life of academics. The aim of this paper is to track the development of GREs over the past 25 years, by critically evaluating their adoption in the UK and Australian higher education sector and their contribution to the commodification of academic labour, and to highlight the resultant tensions between GREs and academic freedom. The paper employs a literature-based analysis, relying on publicly available policy documents and academic studies over the period 1985–2010. GREs are a global phenomenon emanating from new public management reforms and while assessments of university research have been welcomed, they have attracted critique based on their design, the manner in which they have been applied, and the unintended consequences of their implementation on academic freedom in particular. Consistent with international research on the impact of GREs, Australian research assessments appear to be undoing the academic freedom that is central to successful research. Further empirical research on the impact of GREs on academics is urgently needed. 相似文献