全文获取类型
收费全文 | 388篇 |
免费 | 4篇 |
专业分类
教育 | 269篇 |
科学研究 | 32篇 |
各国文化 | 5篇 |
体育 | 45篇 |
综合类 | 1篇 |
文化理论 | 4篇 |
信息传播 | 36篇 |
出版年
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 11篇 |
2019年 | 24篇 |
2018年 | 17篇 |
2017年 | 20篇 |
2016年 | 17篇 |
2015年 | 8篇 |
2014年 | 22篇 |
2013年 | 70篇 |
2012年 | 13篇 |
2011年 | 12篇 |
2010年 | 11篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 9篇 |
2004年 | 11篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1995年 | 7篇 |
1993年 | 5篇 |
1991年 | 2篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1967年 | 2篇 |
1951年 | 1篇 |
1948年 | 2篇 |
1943年 | 1篇 |
1844年 | 1篇 |
排序方式: 共有392条查询结果,搜索用时 15 毫秒
371.
Stefanie Hoehl Vincent M. Reid Eugenio Parise rea Handl Letizia Palumbo Tricia Striano 《Child development》2009,80(4):968-985
The importance of eye gaze as a means of communication is indisputable. However, there is debate about whether there is a dedicated neural module, which functions as an eye gaze detector and when infants are able to use eye gaze cues in a referential way. The application of neuroscience methodologies to developmental psychology has provided new insights into early social cognitive development. This review integrates findings on the development of eye gaze processing with research on the neural mechanisms underlying infant and adult social cognition. This research shows how a cognitive neuroscience approach can improve our understanding of social development and autism spectrum disorder. 相似文献
372.
Vincent Labrot Michael Schindler Pierre Guillot Annie Colin Mathieu Joanicot 《Biomicrofluidics》2009,3(1)
The overall traffic of droplets in a network of microfluidic channels is strongly influenced by the liquid properties of the moving droplets. In particular, the effective hydrodynamic resistance of individual droplets plays a key role in their global behavior. Here we propose two simple and low-cost experimental methods for measuring this parameter by analyzing the dynamics of a regular sequence of droplets injected into an “asymmetric loop” network. The choice of a droplet taking either route through the loop is influenced by the presence of previous droplets that modulate the hydrodynamic resistance of the branches they are sitting in. We propose to extract the effective resistance of a droplet from easily observable time series, namely, from the choices the droplets make at junctions and from the interdroplet distances. This becomes possible when utilizing a recently proposed theoretical model based on a number of simplifying assumptions. Here we present several sets of measurements of the hydrodynamic resistance of droplets, expressed in terms of a “resistance length.” The aim is twofold: (1) to reveal its dependence on a number of parameters, such as the viscosity, the volume of droplets, their velocity as well as the spacing between them. At the same time (2), by using a standard measurement technique, we compare the limitations of the proposed methods. As an important result of this comparison, we obtain the range of validity of the simplifying assumptions made in the theoretical model. 相似文献
373.
Conclusions The results of the present study seem to justify the following conclusions: (1) it is possible to identify several, relatively independent, and psychologically meaningful dimensions of the self-concept; and (2) the self-concept as measured by the Self-concept Scale functions independently of intelligence and academic aptitude as a correlate of academic achievement. Therefore, the new instriument has opotential to make an important contribution to the prediction of academic achievement. Since the istrument is only in its experimental stage, replication and cross-validation studies should be carried out to confirm the findings of the study.OISEBased mainly on Gill (1968). 相似文献
374.
Objectives: To devise and evaluate a sensitive search strategy to retrieve diagnostic studies on specific diagnostic tests for deep vein thrombosis (DVT). Methods: Systematic reviews on diagnostic tests for DVT were identified and the studies cited by them used to produce a reference set of search results (to be used to evaluate different search strategies). Five existing diagnosis search filters were combined to produce a sensitive search. This combined search was then refined to produce a more specific strategy, which was run on medline and the results were checked against the reference set. This search was too specific and was modified to produce a more balanced final strategy, which was again tested and the results compared with the reference set. The sensitivity of this newly created strategy was compared with the existing diagnosis searches already found. Finally, studies identified by the final search strategy were critically appraised for validity and relevance and the selected articles were compared with those found in the reference set. Results: The final filter retrieved 124 out of 126 references from the reference set. From the search result, 227 cohort studies were selected and 147 of these were not cited in any of the systematic reviews on diagnostic tests for DVT. Conclusions: The search strategy had 98.8% sensitivity. The precision of 8.8%, although low, compares well with other strategies with high sensitivity. Most of the systematic reviews on diagnosing a DVT have omitted a number of high quality articles. 相似文献
375.
376.
377.
378.
Vincent Tinto 《Higher Education》1981,10(5):499-516
Recent research on education and occupational attainment has opened up new areas for study. Employing the bilateral or segmented theory of labor markets, this research has begun to reveal both the complexity and variability of schooling's impact upon the diverse work careers of differing groups in society. Specific attention is paid to recent studies of the effect of educational origins upon the work careers of individuals in professional and business—managerial occupations in the United States. Among professional occupations not only do college origins matter but their impact is greater among graduates of low social status backgrounds than among those of high status origins. Implications for our understanding of the role of higher education in social stratification is explored with specific reference to current theories of educational sponsorship. 相似文献
379.
Michal Łukomski Vincent Beltran Foekje Boersma James Druzik Ashley Freeman Marcin Strojecki 《文物保护研究》2018,63(5):181-186
ABSTRACTThis experimental program, implemented by the Managing Collection Environment Initiative at the Getty Conservation Institute, has provided data about the response of historic objects to changes in relative humidity (RH). Alongside other less sensitive documentation techniques (visual observation, physical measurements, photography, and 3D scanning), acoustic emission (AE) was monitored for six historic, museum-like wooden objects exposed to gradually increasing RH variations. Quantitative calibration of AE sensors and an anti-correlation measuring scheme to reduce environmental noise allowed the AE system to effectively trace micro-damage development caused by environmentally induced stress. Using an epidemiological approach, with respect to sample selection and experimental protocol, the obtained results can be used to explore the acceptable range of climate fluctuations for museum collections. The study’s well-controlled environmental protocol also allowed for the examination of the concept of ‘proofed fluctuation’ by the analysis of object response to reoccurring conditions. 相似文献
380.
Vincent Sarich 《Academic Questions》1990,4(1):72-81
Editor's Note: The following is adapted from a letter and accompanying essay that were sent to each of the regents of the University of
California at the close of the spring semester, 1990, by Prof. Sarich. 相似文献