全文获取类型
收费全文 | 1848篇 |
免费 | 344篇 |
国内免费 | 658篇 |
出版年
2024年 | 3篇 |
2023年 | 60篇 |
2022年 | 86篇 |
2021年 | 72篇 |
2020年 | 142篇 |
2019年 | 135篇 |
2018年 | 125篇 |
2017年 | 143篇 |
2016年 | 172篇 |
2015年 | 90篇 |
2014年 | 145篇 |
2013年 | 423篇 |
2012年 | 129篇 |
2011年 | 159篇 |
2010年 | 89篇 |
2009年 | 121篇 |
2008年 | 112篇 |
2007年 | 110篇 |
2006年 | 95篇 |
2005年 | 82篇 |
2004年 | 60篇 |
2003年 | 58篇 |
2002年 | 42篇 |
2001年 | 28篇 |
2000年 | 21篇 |
1999年 | 21篇 |
1998年 | 13篇 |
1997年 | 16篇 |
1996年 | 10篇 |
1995年 | 16篇 |
1994年 | 12篇 |
1993年 | 13篇 |
1992年 | 5篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 6篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 7篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 4篇 |
排序方式: 共有2850条查询结果,搜索用时 15 毫秒
141.
A portfolio forecasting model based on particle swarm optimization (PSO) algorithm with automatic factor scaling is proposed in this Article to effectively improve the accuracy of related analysis model in portfolio application. Firstly, the portfolio problem is analyzed and a hybrid constraint portfolio model is obtained by improving portfolio model with consideration of general portfolio model and combination of market value constraint and upper bound constraint according to Markowitz's theory. Secondly, PSO algorithm is introduced during analysis on portfolio model and solution is found with the hybrid constraint portfolio model of PSO on portfolio. In addition, in order to further improve the performance of PSO in model solution, automatic factor scaling is used for adaptive learning on parameters associated with PSO, to improve convergence of the algorithm. At last, simulation experiments show that the algorithm proposed can obtain a more ideal investment portfolio scheme, thereby reducing investment risks and obtaining greater investment returns. 相似文献
142.
143.
144.
145.
146.
147.
采用地震后建筑物倒塌,被困人员转运的任务情景,以99名消防指挥系大四学员为被试,研究个体情境意识和团队情境意识的关系,以及社会网络关系中的网络密度和结构洞指标在其中的调节作用。结果表明:(1)个体情境意识与团队情境意识不相关,即团队情境意识不是个体情境意识的简单相加;(2)共享情境意识对团队情境意识有负向影响:个体情境意识之间的差异越大,团队情境意识就越高;(3)对于网络密度较大的团队,结构洞对共享情境意识和团队情境意识的关系起到正向调节的作用;(4)对于网络密度较小的团队,结构洞对共享情境意识和团队情境意识的关系起到负向调节的作用。 相似文献
148.
Bianca Thorup Kate Crookes Paul P. W. Chang Nichola Burton Stephen Pond Tze Kwan Li Janet Hsiao Gillian Rhodes 《British journal of psychology (London, England : 1953)》2018,109(3):583-603
People are better at recognizing own-race than other-race faces. This other-race effect has been argued to be the result of perceptual expertise, whereby face-specific perceptual mechanisms are tuned through experience. We designed new tasks to determine whether other-race effects extend to categorizing faces by national origin. We began by selecting sets of face stimuli for these tasks that are typical in appearance for each of six nations (three Caucasian, three Asian) according to people from those nations (Study 1). Caucasian and Asian participants then categorized these faces by national origin (Study 2). Own-race faces were categorized more accurately than other-race faces. In contrast, Asian American participants, with more extensive other-race experience than the first Asian group, categorized other-race faces better than own-race faces, demonstrating a reversal of the other-race effect. Therefore, other-race effects extend to the ability to categorize faces by national origin, but only if participants have greater perceptual experience with own-race, than other-race faces. Study 3 ruled out non-perceptual accounts by showing that Caucasian and Asian faces were sorted more accurately by own-race than other-race participants, even in a sorting task without any explicit labelling required. Together, our results demonstrate a new other-race effect in sensitivity to national origin of faces that is linked to perceptual expertise. 相似文献
149.
Rob Bonemei Andrea I. Costantino Ilenia Battistel Davide Rivolta 《British journal of psychology (London, England : 1953)》2018,109(2):232-243
Faces and bodies are more difficult to perceive when presented inverted than when presented upright (i.e., stimulus inversion effect), an effect that has been attributed to the disruption of holistic processing. The features that can trigger holistic processing in faces and bodies, however, still remain elusive. In this study, using a sequential matching task, we tested whether stimulus inversion affects various categories of visual stimuli: faces, faceless heads, faceless heads in body context, headless bodies naked, whole bodies naked, headless bodies clothed, and whole bodies clothed. Both accuracy and inversion efficiency score results show inversion effects for all categories but for clothed bodies (with and without heads). In addition, the magnitude of the inversion effect for face, naked body, and faceless heads was similar. Our findings demonstrate that the perception of faces, faceless heads, and naked bodies relies on holistic processing. Clothed bodies (with and without heads), on the other side, may trigger clothes-sensitive rather than body-sensitive perceptual mechanisms. 相似文献
150.
Gunes Avci Steven P. Woods Savanna M. Tierney Victoria M. Kordovski Erin E. Morgan 《Applied cognitive psychology》2018,32(5):575-583
Testing can improve later recall of information. However, much less is known about the potential use of testing in promoting the transfer of learning. In this study, we investigated whether testing improves decision‐making performance on a transfer task in a sample of 98 university students using a between‐subjects design. After studying several statements about a fictional disease under different learning conditions (restudy, free recall, and multiple‐choice), participants were asked to recall this information and subsequently make medical decisions concerning the fictional disease (i.e., the transfer task). The present study found no advantage of testing conditions over restudy condition on the 30‐min delayed memory task. However, participants in the active retrieval practice (i.e., free recall) group performed significantly better on the transfer task over those in both restudy and multiple‐choice groups. These results suggest free‐recall tests promote the transfer of learning. 相似文献