全文获取类型
收费全文 | 57705篇 |
免费 | 2215篇 |
国内免费 | 23篇 |
出版年
2020年 | 548篇 |
2019年 | 606篇 |
2018年 | 855篇 |
2017年 | 912篇 |
2016年 | 975篇 |
2015年 | 694篇 |
2014年 | 823篇 |
2013年 | 4071篇 |
2012年 | 1617篇 |
2011年 | 1647篇 |
2010年 | 1032篇 |
2009年 | 969篇 |
2008年 | 1443篇 |
2007年 | 1436篇 |
2006年 | 1273篇 |
2005年 | 1195篇 |
2004年 | 1135篇 |
2003年 | 1035篇 |
2002年 | 1084篇 |
2001年 | 1848篇 |
2000年 | 1804篇 |
1999年 | 1332篇 |
1998年 | 616篇 |
1997年 | 529篇 |
1992年 | 1216篇 |
1991年 | 1117篇 |
1990年 | 1169篇 |
1989年 | 1042篇 |
1988年 | 1014篇 |
1987年 | 1014篇 |
1986年 | 1039篇 |
1985年 | 1099篇 |
1984年 | 849篇 |
1983年 | 799篇 |
1982年 | 571篇 |
1981年 | 538篇 |
1979年 | 986篇 |
1978年 | 662篇 |
1977年 | 629篇 |
1976年 | 596篇 |
1975年 | 860篇 |
1974年 | 973篇 |
1973年 | 985篇 |
1972年 | 875篇 |
1971年 | 807篇 |
1970年 | 774篇 |
1969年 | 817篇 |
1968年 | 1039篇 |
1967年 | 907篇 |
1966年 | 858篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
811.
812.
813.
814.
815.
The following survey is intended to demonstrate and discuss some principle problems of biomagnetism and the application in clinical fields. The development of special technical parameters especially by the SQUID method is initiating new possibilities of research and completing the neurobiologically determinated basis and conditions of neuropsychiatric disorders. The Magnetoencephalography (MEG) will be represent an important role of a new functional diagnostic method. 相似文献
816.
R Witkowski E Ullrich P Pietsch K Weber K Heller T Losanowa I Nitz 《Psychiatrie, Neurologie, und medizinische Psychologie》1985,37(5):255-261
We present four cases of Prader-Willi syndrome. Two of them have an abnormality of a chromosome 15, the other both show different chromosomal abnormalities. Translocations or deletions were found recently in the bands 15q11/12 in about 60% of the cases of Prader-Willi syndrome. The consequences for diagnosis, symptomatology and genetic counselling of the syndrome are discussed. 相似文献
817.
818.
Thomas R. Alley 《Synthese》1985,65(3):411-444
The concept of an ecological niche (econiche) has been used in a variety of ways, some of which are incompatible with a relational or functional interpretation of the term. This essay seeks to standardize usage by limiting the concept to functional relations between organisms and their surroundings, and to revise the concept to include epistemic relations. For most organisms, epistemics are a vital aspect of their functional relationships to their surroundings and, hence, a major determinant of their econiche. Rejecting the traditional dualism of organism and environment, an econiche is defined as the reciprocal (dual) of a functionally specified class of organisms (FSTU). From this perspective, an econiche necessarily implies a certain type of organism, and a class of functionally similar organisms implies a special econiche.The econiche concept is also discussed in relation to other ecological terms that reflect the distributional patterns of organisms, such as habitat, and the concept of an empty niche is criticized.Special thanks are due to Michael Turvery for his part in many stimulating discussions of some of the problems and concepts addressed in this paper. I am also grateful to him and to Claudia Carello, Tim Johnston, Bill Mace, Bernard Patten, Ed Reed, Robert E. Shaw, Bill Warren, and an anonymous reviewer for their comments on earlier drafts of this paper. 相似文献
819.
Recent research on social cognition suggests that lifelike visual and vocal information about a person may strongly mediate the impact of prior social categorical knowledge on social judgements. Other research, however, on the contribution of visual cues to impression formation, suggests that they have relatively little impact. This study sought to resolve these conflicting findings by examining the effect of visual cues on social judgements when subjects possess prior social categorical knowledge varying in salience to the experimental task. Videotaped target interviews were monitored by observers in either sound and vision or sound only, and measures were taken of the targets' perceived personality, their ‘actual’ and ‘predicted’ social performance, and social acceptance by observers. Whilst salience of categorization strongly influenced the quality of judgements, visual cues had little if any effect. However, visual cues strongly influenced subjects' confidence in all three sets of judgements, sound and vision subjects being consistently more confident than their sound only counterparts. The findings are discussed in relation to previous research in both social cognition and visual cues. 相似文献
820.
Additional results from Rutte and Wilke's (1984) study are presented. In the context of a social dilemma situation two variables were manipulated: use and variance. Preference for various decision structures is the issue of the present paper. It appeared that a large majority structure and an unanimity structure were mast preferred. A small majority structure and a structure in which each decides for him/herself were intermediately preferred. Whereas a structure in which one person, a leader, decides for all was least preferred. Further analysis of these data suggested that only the latter two decision structures were influenced by the use and variance manipulations. 相似文献