全文获取类型
收费全文 | 11555篇 |
免费 | 548篇 |
国内免费 | 3篇 |
出版年
2020年 | 147篇 |
2019年 | 161篇 |
2018年 | 271篇 |
2017年 | 243篇 |
2016年 | 257篇 |
2015年 | 188篇 |
2014年 | 217篇 |
2013年 | 869篇 |
2012年 | 358篇 |
2011年 | 392篇 |
2010年 | 244篇 |
2009年 | 201篇 |
2008年 | 310篇 |
2007年 | 297篇 |
2006年 | 272篇 |
2005年 | 231篇 |
2004年 | 231篇 |
2003年 | 209篇 |
2002年 | 215篇 |
2001年 | 436篇 |
2000年 | 397篇 |
1999年 | 277篇 |
1998年 | 117篇 |
1996年 | 96篇 |
1995年 | 100篇 |
1993年 | 99篇 |
1992年 | 215篇 |
1991年 | 221篇 |
1990年 | 210篇 |
1989年 | 208篇 |
1988年 | 212篇 |
1987年 | 194篇 |
1986年 | 179篇 |
1985年 | 183篇 |
1984年 | 164篇 |
1983年 | 117篇 |
1982年 | 119篇 |
1979年 | 155篇 |
1978年 | 97篇 |
1977年 | 100篇 |
1975年 | 142篇 |
1974年 | 162篇 |
1973年 | 188篇 |
1972年 | 162篇 |
1971年 | 144篇 |
1970年 | 131篇 |
1969年 | 133篇 |
1968年 | 183篇 |
1967年 | 136篇 |
1966年 | 146篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
N W Denney 《American journal of community psychology》1988,16(3):409-433
A paper in the American Journal of Community Psychology (AJCP), by Reinke, Holmes, and myself, reported the results of a study of the influence of a friendly visitor program on the cognitive functioning and morale of elderly individuals. The program was reported to have had a significant multivariate effect on a combination of cognitive and morale measures and significant univariate effects on memory, self-perceived health, and activity director's ratings. Being intrigued by the memory finding, I conducted a follow-up study to further investigate the effect of a visitation program on cognitive functioning. In this second study the dependent measures included all of the cognitive variables included in the original study as well as some additional memory variables. The visitation program in the follow-up study had no effect on any of these measures. As a result of my failure to obtain a significant memory effect such as that reported in Reinke et al. (1981), I reanalyzed the data from the original study. In my reanalysis, the only significant effect was a borderline univariate effect for self-perceived health; the multivariate effect did not approach significance. On the basis of my inability to produce the results reported in Reinke et al. when I reanalyzed the original data, I must conclude that the friendly visitor program did not have the effects attributed to it in the original report. 相似文献
43.
The precaution adoption process 总被引:47,自引:0,他引:47
N D Weinstein 《Health psychology》1988,7(4):355-386
This article presents a critique of current models of preventive behavior. It discusses a variety of factors that are usually overlooked-including the appearance of costs and benefits over time, the role of cues to action, the problem of competing life demands, and the ways that actual decision behavior differs from the rational ideal implicit in expectancy-value and utility theories. Such considerations suggest that the adoption of new precautions should be viewed as a dynamic process with many determinants. The framework of a model that is able to accommodate these additional factors is described. This alternative model portrays the precaution adoption process as an orderly sequence of qualitatively different cognitive stages. Data illustrating a few of the suggestions made in the article are presented, and implications for prevention programs are discussed. 相似文献
44.
A right-handed man suffered a left parieto-occipital cerebral infarction, causing agraphia with Gerstmann's syndrome but without major aphasia, alexia, or apraxia. Oral spelling was superior to written spelling. Experiments were performed involving (1) analysis of errors in writing, (2) tasks of visual imagery, and (3) identifying letters drawn without leaving a visual trace. The results suggest that the agraphia and Gerstmann's syndrome are due to a dissociation of language skills and visuospatial skills caused by a dominant parieto-occipital lesion. 相似文献
45.
46.
GEORGE N. SCHLESINGER 《Metaphilosophy》1988,19(3-4):282-293
47.
Multiunit activity (MUA) was recorded chronically in the hippocampus (CA3) and the medial geniculate body (mMG) during habituation to a tone followed by conditioning (tone paired with footshock) or pseudoconditioning (tone/footshock unpaired) in rats previously trained in a lever-pressing for food task (VI 60). In the conditioned group pairing tones with footshocks rapidly induced an increase in the initial CS-evoked response in the mMG, followed by the emergence of a hippocampal response and a marked conditioned suppression of lever-pressing to the tone. In contrast, in the pseudoconditioned group, the stimulus induced only transient cellular changes in the hippocampus and in the mMG, while no behavioral suppression to the tone could be seen. Moreover, presentations of the CS 45 days later induced multiunit and behavioral responses in both structures, only in the conditioned group. These results are used for discussion of the role of learning-induced changes in the sensory structure (mMG) as compared with changes in an associative structure (hippocampus), during acquisition and retention of a conditioned response. 相似文献
48.
Previously we (Bruno & Cutting, 1988) explored the perception of spatial relations among objects laid out in a computer-generated environment. In his commentary on our article, Massaro (1988) raised several issues. The most important is from his reanalysis, which indicated that--because of a subadditive trend in the results--additive and multiplicative strategies fit our data in Experiment 1 about equally well. In reply, we performed a different analysis. Results corroborate subadditivity--and hence multiplicative information combination--in Experiment 1 but provide no evidence for it in Experiments 2 and 3. On the whole, then, the results still support additivity more strongly than any other combination rule and thus support our notion of minimodularity. 相似文献
49.
After thermal cauterization of the area postrema in rats the absence of conditioned taste aversion to sucrose paired with lithium chloride (0.15 M, 3.3 ml/kg) was used as a pharmacologic/behavioral index of area postrema damage. In a subsequent experiment the effects of area postrema lesions on three measures proposed as species-relevant measures of motion sickness were studied, using off-vertical rotation at 150 degrees/s for either 30 or 90 min. Lesions of area postrema did not alter postrotational suppression of drinking or amount of defecation during motion. The initial acquisition of conditioned taste aversion to a novel cider vinegar solution paired with motion was not affected by lesioning of the area postrema, but these taste aversions extinguished more slowly in lesioned rats than in sham-operates or intact controls. Results are discussed in terms of proposed humoral factors which may induce motion sickness and in light of recent data on the role of the area postrema in similar measures in species possessing the complete emetic reflex. 相似文献
50.