全文获取类型
收费全文 | 124774篇 |
免费 | 1909篇 |
国内免费 | 238篇 |
专业分类
教育 | 86984篇 |
科学研究 | 13482篇 |
各国文化 | 2047篇 |
体育 | 9450篇 |
综合类 | 172篇 |
文化理论 | 1141篇 |
信息传播 | 13645篇 |
出版年
2021年 | 958篇 |
2020年 | 1699篇 |
2019年 | 2645篇 |
2018年 | 3146篇 |
2017年 | 3434篇 |
2016年 | 3492篇 |
2015年 | 2397篇 |
2014年 | 3280篇 |
2013年 | 27982篇 |
2012年 | 2430篇 |
2011年 | 2760篇 |
2010年 | 2388篇 |
2009年 | 2674篇 |
2008年 | 2455篇 |
2007年 | 2140篇 |
2006年 | 2431篇 |
2005年 | 2397篇 |
2004年 | 3050篇 |
2003年 | 2413篇 |
2002年 | 2203篇 |
2001年 | 2019篇 |
2000年 | 1663篇 |
1999年 | 1558篇 |
1998年 | 1500篇 |
1997年 | 1555篇 |
1996年 | 1743篇 |
1995年 | 1524篇 |
1994年 | 1512篇 |
1993年 | 1505篇 |
1992年 | 1503篇 |
1991年 | 1424篇 |
1990年 | 1407篇 |
1989年 | 1313篇 |
1988年 | 1185篇 |
1987年 | 1107篇 |
1986年 | 1135篇 |
1985年 | 1397篇 |
1984年 | 1276篇 |
1983年 | 1277篇 |
1982年 | 1268篇 |
1981年 | 1185篇 |
1980年 | 1178篇 |
1979年 | 1230篇 |
1978年 | 1211篇 |
1977年 | 1125篇 |
1976年 | 1001篇 |
1975年 | 814篇 |
1974年 | 804篇 |
1973年 | 771篇 |
1971年 | 628篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
Thomas A. C. Reydon 《Metascience》2015,24(2):259-264
913.
914.
Haseeb Md. Irfanullah 《Learned Publishing》2021,34(1):57-63
- Resilience in the publishing industry can be viewed through a framework of assessing five capitals or assets: human, social, physical, financial, and natural capital.
- A resilient system requires four properties: robustness, redundancy, resourcefulness, and rapidity, and scholarly publishing can be seen to have some element of each.
- The ability to thrive in adversity and bounce back is not found in all parts of the publishing system, with those in the Global South disproportionately disadvantaged.
- The positive changes introduced in the past year need to be retained and elements of inequality and exclusion removed to ensure future resilience and sustainability.
915.
916.
917.
918.
919.
Victoria A. Roach Graham M. Fraser James H. Kryklywy Derek G.V. Mitchell Timothy D. Wilson 《Anatomical sciences education》2019,12(1):32-42
Research suggests that spatial ability may predict success in complex disciplines including anatomy, where mastery requires a firm understanding of the intricate relationships occurring along the course of veins, arteries, and nerves, as they traverse through and around bones, muscles, and organs. Debate exists on the malleability of spatial ability, and some suggest that spatial ability can be enhanced through training. It is hypothesized that spatial ability can be trained in low-performing individuals through visual guidance. To address this, training was completed through a visual guidance protocol. This protocol was based on eye-movement patterns of high-performing individuals, collected via eye-tracking as they completed an Electronic Mental Rotations Test (EMRT). The effects of guidance were evaluated using 33 individuals with low mental rotation ability, in a counterbalanced crossover design. Individuals were placed in one of two treatment groups (late or early guidance) and completed both a guided, and an unguided EMRT. A third group (no guidance/control) completed two unguided EMRTs. All groups demonstrated an increase in EMRT scores on their second test (P < 0.001); however, an interaction was observed between treatment and test iteration (P = 0.024). The effect of guidance on scores was contingent on when the guidance was applied. When guidance was applied early, scores were significantly greater than expected (P = 0.028). These findings suggest that by guiding individuals with low mental rotation ability “where” to look early in training, better search approaches may be adopted, yielding improvements in spatial reasoning scores. It is proposed that visual guidance may be applied in spatial fields, such as STEMM (science, technology, engineering, mathematics and medicine), surgery, and anatomy to improve student's interpretation of visual content. Anat Sci Educ. © 2018 American Association of Anatomists. 相似文献
920.