全文获取类型
收费全文 | 12710篇 |
免费 | 294篇 |
国内免费 | 1篇 |
专业分类
13005篇 |
出版年
2021年 | 104篇 |
2020年 | 155篇 |
2019年 | 178篇 |
2018年 | 285篇 |
2017年 | 278篇 |
2016年 | 287篇 |
2015年 | 203篇 |
2014年 | 226篇 |
2013年 | 930篇 |
2012年 | 378篇 |
2011年 | 430篇 |
2010年 | 273篇 |
2009年 | 233篇 |
2008年 | 335篇 |
2007年 | 312篇 |
2006年 | 305篇 |
2005年 | 244篇 |
2004年 | 244篇 |
2003年 | 230篇 |
2002年 | 227篇 |
2001年 | 442篇 |
2000年 | 416篇 |
1999年 | 286篇 |
1998年 | 120篇 |
1996年 | 108篇 |
1992年 | 227篇 |
1991年 | 238篇 |
1990年 | 224篇 |
1989年 | 214篇 |
1988年 | 226篇 |
1987年 | 197篇 |
1986年 | 186篇 |
1985年 | 198篇 |
1984年 | 174篇 |
1983年 | 148篇 |
1982年 | 132篇 |
1981年 | 110篇 |
1979年 | 172篇 |
1977年 | 111篇 |
1976年 | 105篇 |
1975年 | 156篇 |
1974年 | 172篇 |
1973年 | 206篇 |
1972年 | 165篇 |
1971年 | 150篇 |
1970年 | 128篇 |
1969年 | 143篇 |
1968年 | 198篇 |
1967年 | 149篇 |
1966年 | 148篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
152.
153.
This study replicated the results of an earlier one in which college women showing psychological similarities to anorexics indicated an unrealistically larger body-image relative to controls but only if they were relatively thin. This kind of perceptual enhancement was not found when inanimate objects were rated. The proposal that an enhanced body image plays a dynamic role in motivating food restraint (and may increase the risk of becoming anorexic) was supported by an analysis of dieting strategies. 相似文献
154.
R N Shepard 《Psychological review》1990,97(4):579-580
The neural net model of Staddon and Reid (1990) explains exponential and Gaussian generalization gradients in the same way as the diffusion model of Shepard (1958). The "cognitive" generalization theory of Shepard (1987), which also has been implemented as a connectionist network, goes beyond both of these models in accounting for classification learning. 相似文献
155.
The Priestley duality for Wajsberg algebras 总被引:1,自引:1,他引:0
N. G. Martínez 《Studia Logica》1990,49(1):31-46
The Priestley duality for Wajsberg algebras is developed. The Wajsberg space is a De Morgan space endowed with a family of functions that are obtained in rather natural way.As a first application of this duality, a theorem about unicity of the structure is given. 相似文献
156.
157.
158.
A time-sharing study used shadowing and interpretation/paraphrasing tasks to evaluate lateralization in professional interpreters individually matched to bilingual and monolingual controls. A two-step multivariate general linear model procedure was used to determine lateralized effects and extent of disruption produced by the tasks. Results revealed the monolingual group to be left lateralized for both tasks, but the two bilingual groups were lateralized in the LH only for shadowing. The monolingual group was significantly different from the bilingual groups in the pattern of hand asymmetry for interpretation/paraphrasing. The findings replicate outcomes of prior repeated measures analysis of variance procedures on percentage of change scores. However, new information is added by the more refined analysis. The findings are also discussed in terms of previous laterality studies using similar tasks and subject samples. 相似文献
159.
160.
Ethanol-mediated taste aversions and state-dependency in preweanling (16-day-old) rats 总被引:1,自引:0,他引:1
Requirements for conditioning of an ethanol-mediated taste aversion in 16-day-old rat pups were examined. Experiment 1 demonstrated that preweanling rats are capable of acquiring, in two trials, an aversion to a 15% sucrose solution when followed by intragastric intubation of a 1.2 g/kg dose of 17% v/v ethanol, but not when followed by a 0.4 g/kg dose. Comparison was with control animals given sucrose followed by an equivalent volume isocaloric Half and Half. When the 0.4 g/kg dose of ethanol preceded sucrose presentation by 30 min (Experiment 2), the aversion was learned, suggesting that the effective delay between the sucrose and the critical consequences of the ethanol had been too long with the former procedure. Expression of the sucrose aversion required, however, the reinstatement of the context of intoxication--state-dependent retention. Finally, the results of Experiment 3B indicated that, in addition to the association between the sucrose and the aversive consequences of alcohol intoxication, the orosensory cues resulting from alcohol's direct elimination, via such processes as respiration and salivation, became associated with the appetitive properties of the sucrose. This was evidenced by a conditioned increase in preference for ethanol odor. Possible age-related differences in the ability to associate stimuli with alcohol's unconditioned consequences, and in state dependency are discussed. 相似文献