全文获取类型
收费全文 | 24000篇 |
免费 | 928篇 |
国内免费 | 6篇 |
出版年
2020年 | 243篇 |
2019年 | 355篇 |
2018年 | 436篇 |
2017年 | 418篇 |
2016年 | 452篇 |
2015年 | 335篇 |
2014年 | 455篇 |
2013年 | 2238篇 |
2012年 | 748篇 |
2011年 | 798篇 |
2010年 | 491篇 |
2009年 | 534篇 |
2008年 | 733篇 |
2007年 | 751篇 |
2006年 | 702篇 |
2005年 | 629篇 |
2004年 | 646篇 |
2003年 | 584篇 |
2002年 | 585篇 |
2001年 | 569篇 |
2000年 | 618篇 |
1999年 | 469篇 |
1998年 | 331篇 |
1997年 | 244篇 |
1996年 | 259篇 |
1995年 | 267篇 |
1994年 | 232篇 |
1992年 | 353篇 |
1991年 | 364篇 |
1990年 | 360篇 |
1989年 | 348篇 |
1988年 | 338篇 |
1987年 | 293篇 |
1986年 | 312篇 |
1985年 | 338篇 |
1984年 | 279篇 |
1983年 | 287篇 |
1982年 | 225篇 |
1980年 | 225篇 |
1979年 | 298篇 |
1978年 | 285篇 |
1975年 | 282篇 |
1974年 | 310篇 |
1973年 | 319篇 |
1972年 | 267篇 |
1971年 | 245篇 |
1969年 | 232篇 |
1968年 | 286篇 |
1967年 | 281篇 |
1966年 | 257篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
Paul Dean 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1981,33(2):69-76
Behavioural evidence concerning short-sightedness in rats is apparently conflicting: in some experiments rats have performed poorly with visual stimuli further than about 60 cm distant, while in others they have made efficient use of more distant cues, for example to find their way through mazes. However, in the experiments suggesting short-sightedness, the physical size of the stimuli was not varied, so that stimulus distance and visual angle were confounded. In the present experiment, therefore, the size and distance of the stimuli to be detected were varied independently. Over the range tested (30-160 cm), distance was found to produce relatively slight effects on the smallest detectable visual angle, and these tended to diminish with practice. Thus, no good evidence was found for short-sightedness in rats up to 160 cm, a finding consistent with current views of the structure and image-forming capacities of the rat's eye. The smallest detectable targets were, however, surprisingly large in view of the rat's visual acuity (which is about 1c/deg): at the distances tested, animals required considerable training to run reliably to targets subtending less than 5-10° of visual angle. Difficulties in responding to stationary stimuli of this size are likely to restrict severely the use that rats make of vision both in the laboratory and in their natural surroundings. 相似文献
22.
Convergent and divergent stereo mechanisms were compared in their ability to recover structure from motion. Contrary to a recent result reported by Richards and Lieberman, no difference in their performance was found; both mechanisms appeared equally capable of supporting the perception of good structure from motion. Possible reasons for the disparate results are discussed. 相似文献
23.
NORMAN R. F. MAIER 《Personnel Psychology》1970,23(4):455-461
24.
25.
26.
Abby C King Bess Marcus David Ahn Andrea L Dunn W Jack Rejeski James F Sallis Mace Coday 《Health psychology》2006,25(3):336-347
The authors used recursive partitioning methods to identify combinations of baseline characteristics that predict 2-year physical activity success in each of 3 physical activity interventions delivered in the multisite Activity Counseling Trial. The sample consisted of 874 initially sedentary primary care patients, ages 35-75 years, who were at risk for cardiovascular disease. Predictors of 2-year success were specific to each intervention and represented a range of domains, including physiological, demographic, psychosocial, health-related, and environmental variables. The results indicate how specific patient subgroups (e.g., obese, unfit individuals; high-income individuals in stable health) may respond differently to varying levels and amounts of professional assistance and support. The methods used provide a practical first step toward identifying clinically meaningful patient subgroups for further systematic investigation. 相似文献
27.
28.
Gavin N. Rackoff Daniel W. Lagoni Mia F. Shoshany Nasreen A. Moursi Laura Hennefield 《The British journal of developmental psychology》2022,40(1):170-186
By roughly 6 years of age, children acquire the stereotype that men are more competent than women in science, technology, engineering, and mathematics (STEM), potentially leading to greater trust in scientific information provided by men. This study tested whether 3- to 8-year-old children differentially endorsed conflicting information about science and toys presented by male and female informants depicted as a ‘man’ and ‘woman’ (Exp1) or ‘scientists’ (Exp2). Children were expected to endorse toy testimony from gender-matched informants; thus, the key question concerned endorsement of science testimony. In Exp1 (N = 149), boys and girls showed a same-gender informant preference for toy testimony; however, girls endorsed the male informant's testimony more for science than for toys – but only when tested by a male experimenter. In Exp2 (N = 264), boys and girls showed a same-gender preference, irrespective of content. Findings suggest that STEM-related gender stereotypes might lead girls to trust scientific information presented by men over women in certain contexts. 相似文献
29.
30.
Synthese - The concept of voluntary motor control(VMC) frequently appears in the neuroscientific literature, specifically in the context of cortically-mediated, intentional motor actions. For... 相似文献