全文获取类型
收费全文 | 35391篇 |
免费 | 1337篇 |
国内免费 | 25篇 |
出版年
2020年 | 338篇 |
2019年 | 426篇 |
2018年 | 711篇 |
2017年 | 662篇 |
2016年 | 818篇 |
2015年 | 526篇 |
2014年 | 556篇 |
2013年 | 2472篇 |
2012年 | 1237篇 |
2011年 | 1225篇 |
2010年 | 603篇 |
2009年 | 677篇 |
2008年 | 868篇 |
2007年 | 876篇 |
2006年 | 796篇 |
2005年 | 1942篇 |
2004年 | 1267篇 |
2003年 | 1034篇 |
2002年 | 746篇 |
2001年 | 1068篇 |
2000年 | 1063篇 |
1999年 | 794篇 |
1998年 | 327篇 |
1997年 | 303篇 |
1995年 | 315篇 |
1992年 | 648篇 |
1991年 | 621篇 |
1990年 | 625篇 |
1989年 | 580篇 |
1988年 | 561篇 |
1987年 | 516篇 |
1986年 | 513篇 |
1985年 | 559篇 |
1984年 | 458篇 |
1983年 | 415篇 |
1982年 | 312篇 |
1979年 | 501篇 |
1978年 | 337篇 |
1977年 | 307篇 |
1976年 | 325篇 |
1975年 | 387篇 |
1974年 | 464篇 |
1973年 | 489篇 |
1972年 | 424篇 |
1971年 | 365篇 |
1970年 | 333篇 |
1969年 | 353篇 |
1968年 | 432篇 |
1967年 | 386篇 |
1966年 | 372篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Previous studies showed that random error can explain overconfidence effects typically observed in the literature. One of these studies concluded that, after accounting for random error effects in the data, there is little support for cognitive‐processing biases in confidence elicitation. In this paper, we investigate more closely the random error explanation for overconfidence. We generated data from four models of confidence and then estimated the magnitude of random error in the data. Our results show that, in addition to the true magnitude of random error specified in the simulations, the error estimates are influenced by important cognitive‐processing biases in the confidence elicitation process. We found that random error in the response process can account for the degree of overconfidence found in calibration studies, even when that overconfidence is actually caused by other factors. Thus, the error models say little about whether cognitive biases are present in the confidence elicitation process. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
3.
Human and experimental animal research suggests that social stress in general--and chronic, effortful attempts to exert social control in particular--may contribute to cardiovascular disease. We examined the effects of exerting social influence or control on cardiovascular responses in married couples. Compared to husbands discussing a problem with their wives, husbands attempting to influence or persuade their wives displayed larger increases in systolic blood pressure (SBP) before and during the discussion. Furthermore, these physiological effects were accompanied by increases in anger and a more hostile and coldly assertive interpersonal style. Although wives who engaged in social influence attempts displayed generally similar behavior, they did not show the elevated SBP response or anger. We discuss the results in terms of the social context of cardiovascular reactivity and potential marital factors in cardiovascular health. 相似文献
4.
Ten untreated patients with recently diagnosed Parkinson's disease (PD), 9 treated patients with more advanced pathology, and 17 matched normal controls were investigated with three reaction tasks with increasing cognitive load but identical motor requirements: simple reaction, choice reaction with indicative stimuli, and choice reaction with ambiguous stimuli. Times required until a home key was released (= reaction time) and from then until a response key was pressed (= movement time) were recorded. Estimates of pure decision time (overall response time minus movement time in a simple reaction time task) revealed a difference between advanced and early PD patients. Advanced PD patients showed an overall slowing of decision time in the reaction time tasks, but the effect of the cognitive load of the tasks on the decision time was comparable to a control group. The untreated early PD patients performed quite normally in the more simple decision tasks but showed a disproportionate slowing of decision time in tasks with higher cognitive load. 相似文献
5.
6.
7.
8.
9.
T M?ntyl? L B?ckman 《Journal of experimental psychology. Learning, memory, and cognition》1992,18(6):1298-1309
Adult age differences in the consistency effect were examined in 3 experiments. The consistency effect refers to items inconsistent with expectations being better remembered than items consistent with expectations. Younger and older adults walked into an office room and viewed objects that varied in their consistency with expectation. Immediate and delayed recognition tests on item information (i.e., distractors were defined by their semantic identity) revealed that both age groups recognized unexpected items better than expected items. However, when recognition of token information was requested (i.e., distractors were defined by their physical appearance), younger adults, in contrast to older adults, exhibited consistency effects. Also, under divided attention, young adults revealed the same pattern of data as did elderly adults under full attention. The results are discussed in terms of capacity-related differences in distinctive encoding. 相似文献
10.
W Rakowski C E Dube B H Marcus J O Prochaska W F Velicer D B Abrams 《Health psychology》1992,11(2):111-118
We investigated motivational and cognitive processes of behavior change with respect to mammography screening. One hundred forty-two women (ages 40 and older) recruited from three worksites answered a 41-item questionnaire consisting of statements based on constructs from the transtheoretical model of behavior change. Principal-components analysis identified two factors: a six-item component representing positive perceptions of mammography (Pros) and a six-item component representing avoidance of mammography (Cons). Analysis of variance showed that Pros, Cons, and a derived Decisional Balance measure (Pros minus Cons) were associated with stage of mammography adoption. Results are consistent with applications of the model to smoking cessation. The model is also discussed as it relates to other theories of behavior change and as a general strategy for analyzing perceptual data pertinent to health-related actions and intentions for behavioral change. 相似文献