全文获取类型
收费全文 | 98篇 |
免费 | 1篇 |
专业分类
教育 | 41篇 |
科学研究 | 16篇 |
各国文化 | 1篇 |
体育 | 25篇 |
文化理论 | 7篇 |
信息传播 | 9篇 |
出版年
2023年 | 2篇 |
2021年 | 3篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 4篇 |
2014年 | 2篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 4篇 |
2010年 | 8篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 3篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 2篇 |
1996年 | 2篇 |
1991年 | 1篇 |
1985年 | 2篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1973年 | 1篇 |
1959年 | 1篇 |
1929年 | 1篇 |
排序方式: 共有99条查询结果,搜索用时 890 毫秒
11.
Olivier Chapelle Shihao Ji Ciya Liao Emre Velipasaoglu Larry Lai Su-Lin Wu 《Information Retrieval》2011,14(6):572-592
We study the problem of web search result diversification in the case where intent based relevance scores are available. A
diversified search result will hopefully satisfy the information need of user-L.s who may have different intents. In this
context, we first analyze the properties of an intent-based metric, ERR-IA, to measure relevance and diversity altogether.
We argue that this is a better metric than some previously proposed intent aware metrics and show that it has a better correlation
with abandonment rate. We then propose an algorithm to rerank web search results based on optimizing an objective function
corresponding to this metric and evaluate it on shopping related queries. 相似文献
12.
13.
The present study examined the relationship between aggression and game location in rugby league. We videotaped a random sample of 21 professional rugby league games played in the 2000 Super League season. Trained observers recorded the frequency of aggressive behaviours. Consistent with previous research, which used territoriality theories as a basis for prediction, we hypothesized that the home team would behave more aggressively than the away team. The results showed no significant difference in the frequency of aggressive behaviours exhibited by the home and away teams. However, the away teams engaged in substantially more aggressive behaviours in games they lost compared with games they won. No significant differences in the pattern of aggressive behaviours for home and away teams emerged as a function of game time (i.e. first or second half) or game situation (i.e. when teams were winning, losing or drawing). The findings suggest that while home and away teams do not display different levels of aggression, the cost of behaving aggressively (in terms of game outcome) may be greater for the away team. 相似文献
14.
Bing Bai Jason Weston David Grangier Ronan Collobert Kunihiko Sadamasa Yanjun Qi Olivier Chapelle Kilian Weinberger 《Information Retrieval》2010,13(3):291-314
In this article we present Supervised Semantic Indexing which defines a class of nonlinear (quadratic) models that are discriminatively
trained to directly map from the word content in a query-document or document-document pair to a ranking score. Like Latent
Semantic Indexing (LSI), our models take account of correlations between words (synonymy, polysemy). However, unlike LSI our
models are trained from a supervised signal directly on the ranking task of interest, which we argue is the reason for our
superior results. As the query and target texts are modeled separately, our approach is easily generalized to different retrieval
tasks, such as cross-language retrieval or online advertising placement. Dealing with models on all pairs of words features
is computationally challenging. We propose several improvements to our basic model for addressing this issue, including low
rank (but diagonal preserving) representations, correlated feature hashing and sparsification. We provide an empirical study
of all these methods on retrieval tasks based on Wikipedia documents as well as an Internet advertisement task. We obtain
state-of-the-art performance while providing realistically scalable methods. 相似文献
15.
Magali Brunet Audrey Cochard Christophe Deshayes Chantal Brouca-Cabarrecq Luc Robbiola Jean-Marc Olivier 《文物保护研究》2020,65(2):103-117
ABSTRACTIn many countries, collections of historic aircraft, conserved in Air and Space museums or local associations, reflect the importance of a national or local history. Mostly parked outdoors, aircraft suffer from significant corrosion requiring conservation operations. During renovation, metallic parts are often replaced by association members. This can lead to a major loss of information since industrial archives dealing with materials and processes do not always survive. However, if these elements can be considered, they could be a fundamental source of information on the materials originally used and of the technical history of aeronautics. This work reports a thorough study of aluminium-based alloy parts collected on a Breguet aeroplane dating from the 1950s, during its recent renovation. Thanks to an approach coupling multi-scale material characterisation and research in archives, information on the industrial knowledge is revealed. Several historic grades of aluminium-based alloys were found, namely A-U4G, A-U4G1, and A-U3G, depending on the role of the part. Similarly, different protective coatings were identified (anodic oxidation, primers, and paintings), depending on the role of the metallic part and its location in the plane. Knowledge of the materials from bulk metal to the coated surface is necessary for good conservation practices regarding aeronautical heritage artefacts. Related documents and archives also fundamentally help in understanding such complex artefacts. 相似文献
16.
Olivier Dieu Christophe Schnitzler Clément Llena François Potdevin 《Journal of sports sciences》2020,38(17):1943-1952
ABSTRACT This study aimed to assess which combination of subjective and empirical data might help to identify the expertise level. A group of 10 expert coaches classified 40 participants in 5 different expertise groups based on the video footage of the rallies. The expertise levels were determined using a typology based on a continuum of 5 conative stages: (1) structural, (2) functional, (3) technical, (4) contextual, and (5) expertise. The video allowed empirical measurement of the duration of the rallies, and tri-axial accelerometers measured the intensity of the player’s involvement. A principal component analysis showed that two dimensions explained 54.9% of the total variance in the data and that conative stage and empirical parameters during rallies (duration, intensity of the game) were correlated with axis 1, whereas duration and acceleration data between rallies were correlated with axis 2. A random forest algorithm showed that among the parameters considered, acceleration, duration of the rallies, and time between rallies could predict conative stages with a prediction accuracy above possibility. This study suggests that performance analysis benefits from the confrontation of subjective and objective data in order to design training plans according to the expertise level of the participants. 相似文献
17.
Minerva - In the global academic capitalist race, academics, institutions and countries’ symbolic power results from the accumulation of scientific capital. This paper relies on the... 相似文献
18.
19.
This paper investigates the performance of universities in the transfer of technology using a unique university-level dataset for Spain. The results suggest that universities with established policies and procedures for the management of technology transfer perform better. Universities with large and experienced technology transfer offices (TTOs) generate higher volumes of contract research, but the TTO characteristics appear to matter less for university performance in terms of licensing and creation of spin-offs. Furthermore, universities with a science park perform better than those without, which suggests that the agglomeration of knowledge close to universities has a positive effect on universities’ technology transfer performance. 相似文献
20.
Olivier Girard Sébastien Banzet Nathalie Koulmann Mounir Chennaoui Catherine Drogou Hakim Chalabi 《European Journal of Sport Science》2018,18(10):1346-1356
We tested the hypothesis that backward downhill walking (eccentric component) impairs both voluntary activation and muscle contractile properties in the plantar flexors and delays recovery as compared to a gradient and distance-matched uphill walk. Fourteen males performed two 30-min walking exercises (velocity: 1?m/?s; grade: 25%; load: 12% of body weight), one downhill (DW) and one uphill (UP), in a counterbalanced order, separated by 6?weeks. Neuromuscular test sessions were performed before, after, 24-, 48- and 72-h post-exercise, including motor nerve stimulations during brief (5?s) and sustained (1?min) maximal isometric voluntary contractions of the plantar flexors. DW (?18.1?±?11.1%, P?.001), but not UP (?6.0?±?7.7%, P?=.15), decreased torque production during brief contractions for at least three days post-exercise (P?.05). Voluntary activation during brief contractions decreased after DW (P?.05), but not UP, and recovered by 24?h. Both UP (?9.3?±?9.0%, P?=?.024) and DW (?25.6?±?10.3%, P?.001) decreased torque production during sustained contractions but voluntary activation (P?=?.001) was lower in DW than UP. Peak twitch torque and maximum rates of torque development and relaxation were equally reduced after UP and DW (P?.05), and recovered by 24?h. DW induced an increase in muscle soreness with peak values observed 48?h post-walking (P?.001), whereas post-UP exercise changes were non-significant (all P?>?.05). Using a direct comparison, the capacity to drive the plantar flexors during sustained contractions remains sub-optimal during the three-day recovery period in response to non-exhaustive, downhill backward walking in reference to an uphill exercise matched for distance covered. 相似文献