全文获取类型
收费全文 | 8808篇 |
免费 | 344篇 |
国内免费 | 1篇 |
专业分类
9153篇 |
出版年
2020年 | 110篇 |
2019年 | 145篇 |
2018年 | 167篇 |
2017年 | 202篇 |
2016年 | 231篇 |
2015年 | 168篇 |
2014年 | 215篇 |
2013年 | 965篇 |
2012年 | 343篇 |
2011年 | 332篇 |
2010年 | 248篇 |
2009年 | 229篇 |
2008年 | 330篇 |
2007年 | 319篇 |
2006年 | 298篇 |
2005年 | 265篇 |
2004年 | 282篇 |
2003年 | 253篇 |
2002年 | 306篇 |
2001年 | 111篇 |
2000年 | 108篇 |
1999年 | 134篇 |
1998年 | 140篇 |
1997年 | 127篇 |
1996年 | 112篇 |
1995年 | 134篇 |
1994年 | 114篇 |
1993年 | 103篇 |
1992年 | 112篇 |
1991年 | 103篇 |
1990年 | 95篇 |
1989年 | 85篇 |
1988年 | 73篇 |
1987年 | 73篇 |
1986年 | 75篇 |
1985年 | 88篇 |
1984年 | 108篇 |
1983年 | 126篇 |
1982年 | 119篇 |
1981年 | 149篇 |
1980年 | 106篇 |
1979年 | 123篇 |
1978年 | 129篇 |
1977年 | 118篇 |
1976年 | 107篇 |
1975年 | 111篇 |
1974年 | 110篇 |
1973年 | 67篇 |
1972年 | 64篇 |
1969年 | 56篇 |
排序方式: 共有9153条查询结果,搜索用时 0 毫秒
101.
William Hodos James C. Bonbright Jr. 《Journal of the experimental analysis of behavior》1972,18(3):471-479
Pigeons were trained in a conditional discrimination procedure to discriminate between visual stimuli that varied in intensity. The magnitude of the intensity difference ranged from 0.80 to 0.05 logarithmic units. Psychometric functions were calculated from the data and the mean difference threshold for the 11 subjects was approximately 0.12 logarithmic units. A signal-detection analysis of the data suggested that stimuli that were below the calculated threshold were detectible to the subjects. 相似文献
102.
103.
Modifications of the Hewlett-Packard version of the BASIC language to permit its use in data acquisition and control of on-line experiments are described. The resulting software system is an easy-to-use interpretative compiler. 相似文献
104.
105.
106.
A discriminated Sidman avoidance procedure used by Forgione (1970) was replicated using a head-poke response instead of a leverpress as the avoidance operant. The resultant data were described in terms of the five dependent measures reported by Forgione. Head-poke avoidance was found to be more efficient than its leverpress counterpart and compared very favorably with the lever-disabling (or shock-timer-on) procedure used by Forgione to break up inefficient leverpress behavior patterns. 相似文献
107.
108.
A restraint and catheter-protection system consisting of a Plexiglas helmet and a nylon-tubing protector line has been developed to permit the long-term study of drug self-administration in monkeys. Frequent observations of monkeys in the system over a period exceeding a year have shown that the technique satisfies the requirements for long-term study of drug administration through an indwelling catheter and avoids several recurring problems inherent in other protection systems. Additional applications of the helmet and protector line are discussed. 相似文献
109.
A basic and potentially dangerous problem that may occur in the use of triggered constant-current generators for stimulation is discussed in the general case. A solution with schematic illustration is presented for one specific constant-current generator, the CCS-1A manufactured by Electronics of Life Sciences, Inc. 相似文献
110.
James M. Swanson Delos D. Wickens 《Quarterly journal of experimental psychology (2006)》1970,22(3):378-383
The release from PI methodology was used to test Oldfield's (1966) suggestion that human memory is organized in part on the basis of frequency of occurrence. An observed release from PI identified frequency of occurrence as an encoding category and provided support for the underlying assumptions of Oldfield's model. 相似文献