全文获取类型
收费全文 | 3797篇 |
免费 | 186篇 |
国内免费 | 3篇 |
出版年
2020年 | 54篇 |
2019年 | 63篇 |
2018年 | 100篇 |
2017年 | 119篇 |
2016年 | 110篇 |
2015年 | 66篇 |
2014年 | 94篇 |
2013年 | 478篇 |
2012年 | 128篇 |
2011年 | 128篇 |
2010年 | 85篇 |
2009年 | 90篇 |
2008年 | 157篇 |
2007年 | 138篇 |
2006年 | 104篇 |
2005年 | 121篇 |
2004年 | 94篇 |
2003年 | 95篇 |
2002年 | 85篇 |
2001年 | 38篇 |
2000年 | 52篇 |
1999年 | 47篇 |
1998年 | 63篇 |
1997年 | 42篇 |
1996年 | 44篇 |
1995年 | 41篇 |
1994年 | 45篇 |
1992年 | 52篇 |
1990年 | 37篇 |
1989年 | 40篇 |
1988年 | 41篇 |
1987年 | 32篇 |
1986年 | 45篇 |
1985年 | 38篇 |
1984年 | 55篇 |
1983年 | 41篇 |
1982年 | 38篇 |
1981年 | 46篇 |
1980年 | 50篇 |
1979年 | 39篇 |
1978年 | 48篇 |
1977年 | 52篇 |
1976年 | 50篇 |
1975年 | 57篇 |
1974年 | 48篇 |
1973年 | 56篇 |
1972年 | 37篇 |
1971年 | 35篇 |
1970年 | 39篇 |
1968年 | 42篇 |
排序方式: 共有3986条查询结果,搜索用时 252 毫秒
51.
In two experiments, we assessed the ability of a feedback stimulus during helplessness training to reduce the performance deficits common to inescapable shock. In each experiment, four groups of rats were exposed to either escapable shock (E), inescapable shock with a feedback stimulus following shock termination (Y-FS), inescapable shock with no feedback stimulus (Y-NFS), or no shock (N). The feedback stimulus eliminated the interference effects of inescapable shock when tested with an FR-3 lever press escape task (Experiment 1) or on an FR-1 task with a 3-s delay between the response and shock termination (Experiment 2). These results suggest that stress-induced biochemical changes may mediate the interference effects seen in inescapably shocked rats. 相似文献
52.
53.
Joseph Henrich 《Zygon》2023,58(2):405-424
This article argues that understanding human uniqueness requires recognizing that we are a cultural species whose evolution has been driven by the interaction among genes and culture for over a million years. Here, I review the basic argument, incorporate recent findings, and highlight ongoing efforts to apply this approach to more deeply understand both the universal aspects of our cognition as well as the variation across societies. This article will cover (1) the origins and evolution of our capacities for culture, (2) examples of specialized mental abilities such as those related to mechanical causality, prestige, and cooperation, and (3) recent efforts to apprehend our capacities for abstraction. I close by discussing common canards that generate confusion in mapping what makes us human. 相似文献
54.
Joseph J. Siev Richard E. Petty Borja Paredes Pablo Briñol 《Social and Personality Psychology Compass》2023,17(8):e12767
People generally intend to act more on beliefs and attitudes about which they have greater certainty. However, we introduce a boundary condition to the positive association between certainty and behavioral intentions—behavioral extremity. Uncertainty about a threatening issue like COVID-19 can be disconcerting, and we propose that uncertain people cope in part through increased openness to extreme actions like accepting risky medical treatments and aggression toward those defying mitigation policies. Testing this, we compiled and analyzed all the data on certainty about COVID-19 mitigation policies and willingness to engage in mitigation-related behaviors that our lab collected during the pandemic (6 samples, 20 behaviors, Ns up to 1496). External ratings of the behaviors' extremity moderated certainty-willingness associations: whereas greater certainty was associated with increased willingness to engage in moderate behaviors (the typical result), lower certainty was associated with increased willingness to engage in extreme behaviors, especially among those worried about becoming ill. 相似文献
55.
Shayna Skakoon-Sparling Paolo A. Palma Adhm Zahran Trevor A. Hart David M. Moore Joseph Cox Nathan J. Lachowsky Milada Dvorakova Emerich Daroya Daniel Grace 《Social and Personality Psychology Compass》2023,17(9):e12814
In March 2020, in response to the COVID-19 pandemic, Canadian provincial governments instituted a variety of public health measures that included social distancing and isolation, which may have had unintended consequeses. According to the Loneliness and Sexual Risk Model, gay, bisexual, and other men who have sex with men (GBM) often cope with loneliness through risky sexual behaviors. Previous studies have demonstrated that COVID-19 measures such as social distancing and isolation led to increases in loneliness; thus, these measures may also have led to elevated sexual risk-taking among some GBM. Participants were recruited from an ongoing cohort study on GBM health and well-being, and were included in the current analysis if they had completed relevant study questions (n = 1134). GBM who reported lower levels of social support pre-COVID-19, were younger, and lived alone each reported greater loneliness during the first year of COVID-19. Although feelings of loneliness did not predict sexual risk-taking within the first year of COVID-19, loneliness did predict greater sexual risk-taking 6 months later. Additionally, younger GBM and those living alone were more likely to engage in sexual risk-taking at both COVID-19 data collection points. These findings offer some support of the Loneliness and Sexual Risk Model; however, it is possible that the unique circumstances of the COVID-19 pandemic resulted in a temporary suspension of this association, as many GBM took steps to protect themselves and partners in the context of COVID-19. 相似文献
56.
Joseph B. Sidowski 《Behavior research methods》1970,2(6):267-288
The characteristics and costs of minicomputers are discussed along with peripherals, time-sharing, and turnkey systems. The article concludes with a survey of over 100 small computer systems. 相似文献
57.
M. B. Sterman J. J. Lynch M. T. Orne D. Paskewitz J. Costello N. Nicolov O. Diankov M. Popova E. Tsvetanska Robert G. Grenell J. J. Izquierdo V. H. Mark Joseph Germana N. Zill William P. Paré Joseph E. O. Newton George C. Offutt Walter Ehrlich Joseph E. D. Newton Julij Tosef J. Perez-Cruet Chester R. Wilpizeski John F. Lontz Andrew Livingston Joseph W. Cullen Samuel A. Corson Herman R. Weed Elizabeth O. Corson O. D. Murphree Paul N. Morgan Ruth Jarman J. Antal T. A. Ban J. V. Ananth H. E. Lehmann A. Ulric Moore Richard H. Barnes Wilson G. Pond 《Integrative psychological & behavioral science》1970,5(3):185-193
58.
Joseph H. McFarland 《Attention, perception & psychophysics》1970,7(2):91-93
When letters of the word POT and the nonsense syllable OTP are presented in a typical orientation (horizontal) and a typical order (left to right, up to down), succession threshold is lower relative to presentation in an atypical orientation (vertical) and an atypical order (right to left, down to up). These results are interpreted as showing that learning to read English establishes both orientation and order parameters of a hypothetical analysis operation 相似文献
59.
Student personnel services for the elementary school utilizing counselor, social worker, and psychologist are discussed with respect to their overlapping and unique skills. As a solution to the manpower shortage, a program for multidisciplinary training of paraprofessionals is suggested. 相似文献
60.
The Journal of Value Inquiry - 相似文献