全文获取类型
收费全文 | 831篇 |
免费 | 54篇 |
国内免费 | 1篇 |
出版年
2022年 | 9篇 |
2021年 | 14篇 |
2020年 | 13篇 |
2019年 | 26篇 |
2018年 | 28篇 |
2017年 | 32篇 |
2016年 | 36篇 |
2015年 | 23篇 |
2014年 | 28篇 |
2013年 | 83篇 |
2012年 | 44篇 |
2011年 | 44篇 |
2010年 | 29篇 |
2009年 | 26篇 |
2008年 | 28篇 |
2007年 | 32篇 |
2006年 | 35篇 |
2005年 | 26篇 |
2004年 | 22篇 |
2003年 | 17篇 |
2002年 | 14篇 |
2001年 | 16篇 |
2000年 | 7篇 |
1999年 | 16篇 |
1998年 | 12篇 |
1997年 | 10篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 10篇 |
1993年 | 13篇 |
1992年 | 14篇 |
1991年 | 11篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1987年 | 9篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1981年 | 9篇 |
1979年 | 5篇 |
1978年 | 12篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1973年 | 6篇 |
1969年 | 6篇 |
1968年 | 6篇 |
1966年 | 7篇 |
1965年 | 4篇 |
1964年 | 5篇 |
排序方式: 共有886条查询结果,搜索用时 15 毫秒
881.
Since visible persistence of grating patterns increases with spatial frequency, it is often inferred that the perceived duration of a grating is also longer at higher spatial frequencies. However, other work has demonstrated that the perceived onset of a grating is also delayed at higher spatial frequencies. Thus it is impossible to infer the subjective duration from the results of visible persistence studies alone. In order to estimate perceived duration in the present study, reaction times (RTs) to grating onsets and offsets were measured for a range of spatial frequencies. The results indicate that although the perceived duration (ie the difference between offset and onset RTs) was consistently longer than the physical duration, the estimates of perceived duration did not vary with changes in spatial frequency. Differences between the present results and earlier findings are interpreted in the context of the different methods used to measure perceived offset. 相似文献
882.
883.
Predictors and Outcomes of Psychiatric Hospitalization in Youth Presenting to the Emergency Department with Suicidality
下载免费PDF全文
![点击此处可从《Suicide & life-threatening behavior》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Jennifer L. Hughes PhD Nicholas L. Anderson PhD Jessica L. Wiblin BA Joan R. Asarnow PhD 《Suicide & life-threatening behavior》2017,47(2):193-204
Youth suicide attempters presenting to the emergency department (ED) are frequently admitted to psychiatric inpatient hospitals, yet little is known about how clinicians decide which youths to admit versus discharge to outpatient care. We examine predictors of inpatient hospitalization and describe service use outcomes associated with hospitalization in 181 youths drawn from consecutive ED admissions for suicidality. Predictors of hospitalization include ED site, suicide plan, and parent report of problems. Hospitalization was associated with improved linkage to outpatient treatment and more intensive service use. Future research is needed to understand the best service delivery and treatments for these high‐risk youth. 相似文献
884.
Jeremy S. Langford Sydney R. Batchelder D. Austin Haste Elizabeth P. Thuman Raymond C. Pitts Christine E. Hughes 《Journal of the experimental analysis of behavior》2021,116(1):3-20
Extended pausing during discriminable transitions from rich-to-lean conditions can be viewed as escape (i.e., rich-to-lean transitions function aversively). Thus, an anxiolytic drug would be predicted to mitigate the aversiveness and decrease pausing. In the current experiment, pigeons' key pecking was maintained by a multiple fixed-ratio fixed-ratio schedule of rich (i.e., larger) or lean (i.e., smaller) reinforcers. Intermediate doses (3.0-10.0 mg/kg) of chlordiazepoxide differentially decreased median pauses during rich-to-lean transitions. Relatively small decreases in pauses occurred during lean-to-lean and rich-to-rich transitions. Effects of chlordiazepoxide on pausing occurred without appreciable effects on run rates. These findings suggest that signaled rich-to-lean transitions function aversively. 相似文献
885.
886.