全文获取类型
收费全文 | 2069篇 |
免费 | 111篇 |
国内免费 | 1篇 |
专业分类
2181篇 |
出版年
2024年 | 8篇 |
2023年 | 31篇 |
2022年 | 16篇 |
2021年 | 43篇 |
2020年 | 73篇 |
2019年 | 71篇 |
2018年 | 104篇 |
2017年 | 92篇 |
2016年 | 106篇 |
2015年 | 69篇 |
2014年 | 83篇 |
2013年 | 237篇 |
2012年 | 131篇 |
2011年 | 133篇 |
2010年 | 78篇 |
2009年 | 66篇 |
2008年 | 88篇 |
2007年 | 96篇 |
2006年 | 72篇 |
2005年 | 78篇 |
2004年 | 65篇 |
2003年 | 63篇 |
2002年 | 59篇 |
2001年 | 42篇 |
2000年 | 33篇 |
1999年 | 38篇 |
1998年 | 26篇 |
1997年 | 20篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1994年 | 12篇 |
1993年 | 14篇 |
1992年 | 15篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 7篇 |
1986年 | 12篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 4篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1970年 | 2篇 |
排序方式: 共有2181条查询结果,搜索用时 15 毫秒
221.
Cognitive development of lead exposed children from ages 6 to 15 years: an application of growth curve analysis. 总被引:2,自引:0,他引:2
The effect of lead exposure on cognitive growth patterns was assessed in a longitudinal study of 196 children. Performances on tests of verbal comprehension and perceptual organization (Vocabulary & Block Design, Wechsler Intelligence Scales for Children) were measured at ages 6.5, 11 and 15 years. Growth curve analyses revealed that the quadratic model best described the relationship between test scores and age. Children with higher lead levels, as measured at age 15 years, demonstrated lower verbal comprehension scores over time and greater decline in their rate of Vocabulary development at age 15 years, as compared to children with lower lead levels. Lead exposure was not significantly associated with growth in perceptual organization test scores. Socioeconomic status and maternal intelligence were statistically significantly associated with growth patterns for both test scores, independent of the effects of lead. The findings suggest that lead negatively impacts the developmental progression of specific cognitive skills from childhood through adolescence. 相似文献
222.
223.
224.
Yong-Bock Kim 《The Ecumenical review》1979,31(2):169-178
225.
226.
Tara E. Santmire Sarit Kraus Toni E. Santmire Jonathan Wilkenfeld Kim M. Holley & Kristian S. Gleditsch 《Political psychology》1998,19(4):721-748
This paper reports on a series of experiments designed to assess the impact of grouping decision makers by level of cognitive complexity on the outcomes they attain in crisis negotiations. The participants—University of Maryland undergraduates who took roles in a simulated international hostage crisis—used a computer decision support system and a controlled network environment for communications. The goal of the experiments was to better understand the dynamics that lead certain types of groupings to have greater success in negotiations, and that lead certain groups of adversaries to achieve more mutually beneficial outcomes such as compromise and agreement. The findings point to a positive relationship between the level of homogeneity in cognitive complexity among decision makers and the achievement of positive outcomes in crisis negotiations. 相似文献
227.
228.
229.
To indicate motion in a static drawing, artists often include lines trailing a moving object. The use of these motion lines is notable because they do not seem to be related to anything in the optic array. The dynamic behavior of a neural-network model for contour detection is analyzed and it is shown that it generates trails of oriented responses behind moving stimuli. The properties of the oriented response trails are shown to correspond to motion lines. The model generates trails of different orientations depending on the speed and length of the movement, and thereby predicts different uses of two types of motion lines. The model further predicts that motion lines should bias real motion in some situations. An experiment relating motion lines to ambiguous motion percepts demonstrates that motion lines contribute to motion percepts. 相似文献
230.