全文获取类型
收费全文 | 9860篇 |
免费 | 368篇 |
国内免费 | 3篇 |
出版年
2020年 | 121篇 |
2019年 | 176篇 |
2018年 | 183篇 |
2017年 | 226篇 |
2016年 | 245篇 |
2015年 | 183篇 |
2014年 | 237篇 |
2013年 | 1070篇 |
2012年 | 376篇 |
2011年 | 374篇 |
2010年 | 282篇 |
2009年 | 248篇 |
2008年 | 356篇 |
2007年 | 346篇 |
2006年 | 328篇 |
2005年 | 302篇 |
2004年 | 306篇 |
2003年 | 283篇 |
2002年 | 342篇 |
2001年 | 134篇 |
2000年 | 129篇 |
1999年 | 152篇 |
1998年 | 153篇 |
1997年 | 143篇 |
1996年 | 127篇 |
1995年 | 158篇 |
1994年 | 122篇 |
1993年 | 120篇 |
1992年 | 124篇 |
1991年 | 115篇 |
1990年 | 105篇 |
1989年 | 96篇 |
1988年 | 86篇 |
1987年 | 84篇 |
1986年 | 81篇 |
1985年 | 107篇 |
1984年 | 125篇 |
1983年 | 132篇 |
1982年 | 126篇 |
1981年 | 155篇 |
1980年 | 119篇 |
1979年 | 138篇 |
1978年 | 139篇 |
1977年 | 134篇 |
1976年 | 120篇 |
1975年 | 122篇 |
1974年 | 124篇 |
1973年 | 81篇 |
1972年 | 74篇 |
1969年 | 62篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
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
142.
143.
144.
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
145.
146.
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
147.
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
148.
Two groups of eight Ss each and one group of seven Ss were exposed to optical tilts (T) of 50, 40, 30, 20, and 10 deg in succession. Exposure time at each tilt was 3, 15, and 27 min in Groups 1, 2, and 3, respectively. Trend analyses of the functions relating level of adaptation to T showed significant quadratic components for Group 1, quadratic and linear components for Group 2, and only linear components for Group 3. These results were consistent with derivations from a memory-comparator model of perceptual adaptation. 相似文献
149.
Satinder N. Manocha Gordon Winocur John A. Mills 《Quarterly journal of experimental psychology (2006)》1970,22(3):462-466
Four groups of rats received 0, 3, 6 or 9 days of overtraining after having reached stable performance on a continuous reinforcement bar pressing schedule. Half the subjects in each group had previously been designated emotionally reactive or non-reactive in terms of defecation rates in an open-field test. Following training, there were four test days in which bar pressing in each group was examined in the presence or absence of white noise. The major findings were that, in both the reactive and non-reactive groups, white noise produced a fear reaction which significantly depressed bar pressing at low levels of habit strength while having an energizing effect at higher levels. The results were interpreted as supporting Bardach's (1960) hypothesis that anxiety introduced early in practice is more disruptive than when introduced late in practice. 相似文献
150.
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