全文获取类型
收费全文 | 65260篇 |
免费 | 2764篇 |
国内免费 | 37篇 |
出版年
2020年 | 662篇 |
2019年 | 796篇 |
2018年 | 1113篇 |
2017年 | 1092篇 |
2016年 | 1235篇 |
2015年 | 880篇 |
2014年 | 1026篇 |
2013年 | 4783篇 |
2012年 | 1977篇 |
2011年 | 1954篇 |
2010年 | 1202篇 |
2009年 | 1225篇 |
2008年 | 1686篇 |
2007年 | 1678篇 |
2006年 | 1485篇 |
2005年 | 1374篇 |
2004年 | 1317篇 |
2003年 | 1186篇 |
2002年 | 1228篇 |
2001年 | 2118篇 |
2000年 | 2059篇 |
1999年 | 1506篇 |
1998年 | 693篇 |
1997年 | 624篇 |
1996年 | 592篇 |
1992年 | 1350篇 |
1991年 | 1255篇 |
1990年 | 1258篇 |
1989年 | 1145篇 |
1988年 | 1143篇 |
1987年 | 1070篇 |
1986年 | 1098篇 |
1985年 | 1210篇 |
1984年 | 960篇 |
1983年 | 853篇 |
1982年 | 643篇 |
1979年 | 1072篇 |
1978年 | 725篇 |
1977年 | 681篇 |
1976年 | 686篇 |
1975年 | 878篇 |
1974年 | 1019篇 |
1973年 | 1089篇 |
1972年 | 927篇 |
1971年 | 852篇 |
1970年 | 821篇 |
1969年 | 833篇 |
1968年 | 1077篇 |
1967年 | 932篇 |
1966年 | 866篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
An electronic apparatus using infrared beams for monitoring the movements of individual bees under dark conditions is described. The searching behavior of workers in an arena was monitored over 2-h periods. Mean ambulatory velocity for one bee over a distance of 100 mm was 45.6±1.51 mm/sec (n=45). Thigmokinesis and temporal activity patterns are illustrated. 相似文献
54.
55.
56.
Erin M. Leddon Sandra R. Waxman Douglas L. Medin 《The British journal of developmental psychology》2011,29(3):375-395
Previous work on children's intuitive knowledge about the natural world has documented their difficulty in acquiring an overarching concept of biological life that includes plants as well as humans and non‐human animals. It has also suggested that the acquisition of fundamental biological concepts like alive and die may be influenced by the language used to describe them, as evidenced by differences between English‐ and Indonesian‐speaking children's performance in tasks involving these concepts. Here, we examine one particularly important source of linguistic information available to children during this acquisition process: everyday conversations with their parents. We take a cross‐linguistic approach in analysing the evidence available to English‐ and Indonesian‐speaking children as they acquire meanings for words corresponding to the concepts alive and die . Our analysis illustrates that young children acquiring English and Indonesian are faced with distinct problems, but that parental input in both languages does little to support the acquisition of broad, inclusive biological concepts. 相似文献
57.
In this paper, we organize past and present theories and models of creativity by using a new conceptual framework—the creativity matrix—with the aim of highlighting the dimensions of creativity we know a lot about and those we tend to either ignore or find difficult to study. This matrix is formed by bringing together a developmental model of creativity (the 4 C's) and a structural one (the 5 A's). We start by briefly describing these two conceptual frameworks, and then, we proceed to exploring the matrix itself by describing how the 5 A's are dynamically organized at each “level” of the 4 C's. Importantly, our overview of the matrix is informed by existing models and concepts that address one of more of the C's and the A's. This gives us a unique opportunity to take stock of what has been studied so far and, toward the end, consider new avenues for the development of theory and research agendas within creativity studies. 相似文献
58.
This paper examines college students' attributions about suicide as a function of gender and context (athletic vs. relationship failure). Results indicated that male athletes who suicided were considered more emotionally well-adjusted compared to males who suicided because of a relationship failure and all females. Male and female athletes who suicided were seen as more competent and less distressed compared to those who suffered a failed relationship. Females were also seen as more distressed compared to males. These results are discussed in terms of a positive bias toward athletes in our society as well as gender stereotypes. Implications of these findings as well as methodological limitations are discussed. 相似文献
59.
60.
G. C. Preston 《The Quarterly Journal of Experimental Psychology Section B: Comparative and Physiological Psychology》1985,37(1):23-31
Rats' lever presses on a retractable lever earned brief presentations of discriminative stimuli signalling periods in which responding on an alternative lever was either non-reinforced (extinction) or reinforced on a random ratio schedule. The predictions of two theoretical accounts of this behaviour were tested by studying the effects of omitting either the stimulus signalling the reinforced or that signalling the non-reinforced schedule component. Under these conditions rats' behaviour is determined by the conditioned, affective properties of the stimuli rather than by their purely informational properties. 相似文献