全文获取类型
收费全文 | 61491篇 |
免费 | 1286篇 |
国内免费 | 3篇 |
专业分类
62780篇 |
出版年
2020年 | 570篇 |
2019年 | 758篇 |
2018年 | 1002篇 |
2017年 | 1037篇 |
2016年 | 1104篇 |
2015年 | 804篇 |
2014年 | 943篇 |
2013年 | 4394篇 |
2012年 | 1759篇 |
2011年 | 1928篇 |
2010年 | 1212篇 |
2009年 | 1185篇 |
2008年 | 1704篇 |
2007年 | 1718篇 |
2006年 | 1563篇 |
2005年 | 1380篇 |
2004年 | 1285篇 |
2003年 | 1204篇 |
2002年 | 1315篇 |
2001年 | 1988篇 |
2000年 | 1962篇 |
1999年 | 1500篇 |
1998年 | 714篇 |
1997年 | 630篇 |
1996年 | 625篇 |
1993年 | 569篇 |
1992年 | 1254篇 |
1991年 | 1159篇 |
1990年 | 1134篇 |
1989年 | 1035篇 |
1988年 | 1017篇 |
1987年 | 977篇 |
1986年 | 1048篇 |
1985年 | 1056篇 |
1984年 | 888篇 |
1983年 | 807篇 |
1982年 | 565篇 |
1981年 | 566篇 |
1979年 | 945篇 |
1978年 | 677篇 |
1975年 | 771篇 |
1974年 | 826篇 |
1973年 | 921篇 |
1972年 | 773篇 |
1971年 | 730篇 |
1970年 | 655篇 |
1969年 | 673篇 |
1968年 | 864篇 |
1967年 | 782篇 |
1966年 | 659篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
311.
Michael T. Nietzel Ronald C. Dillehay Melissa J. Himelein 《Behavioral sciences & the law》1987,5(4):467-477
With a sample of 18 capital cases tried in Kentucky, South Carolina, and California, we attempted to replicate an earlier study which showed that significantly more defense challenges for cause were granted under conditions of sequestered, individual voir dire than when voir dire was conducted under less enhanced conditions. In the current sample, sequestered, individual voir dire again resulted in more defense removals for cause than obtained with less extensive voir dire. We present data on the defense removals for cause partitioned into five categories according to the reason for the challenge and analyze the effects of jury selection consultants on the various indices of voir dire as well as final sentence. 相似文献
312.
Peer-group affiliation and adolescent self-esteem: an integration of ego-identity and symbolic-interaction theories 总被引:4,自引:0,他引:4
To evaluate expectations derived from ego-identity theory and symbolic-interaction theories about the association between self-concept and peer-group affiliations in adolescence, we examined the self-esteem of 221 7th through 12th graders associated by peers with one of five major school crowds and 106 students relatively unknown by classmates and not associated with any school crowd. Among crowd members, self-esteem was directly related to the position of one's crowd in the peer-group status hierarchy (based on both peer-rated and self-perceived crowd affiliation). Outsiders' self-esteem differed in relation to the accuracy of their reflected appraisal of and the salience they attached to crowd affiliation. Crowd members as a whole exhibited higher self-esteem than outsiders as a whole. Differences, however, were mediated by crowd status, salience of crowd affiliation, and the accuracy of reflected appraisals. An adequate interpretation of the findings required an integration of Festinger's (1954, 1957) social comparisons and cognitive-dissonance theories, Cooley's (1902) notions of reflected appraisal, and Newman and Newman's (1976) extrapolations from ego-identity theory. 相似文献
313.
Emotion knowledge: further exploration of a prototype approach 总被引:14,自引:0,他引:14
P Shaver J Schwartz D Kirson C O'Connor 《Journal of personality and social psychology》1987,52(6):1061-1086
314.
H J Otto E Willenberg D Müller R H?fs J Freitag A Fiedler R Steinke 《Psychiatrie, Neurologie, und medizinische Psychologie》1987,39(12):748-753
The results of an evaluation of the perfusion scintigraphy findings of 350 hospitalised neurological patients and 55 more strictly selected neurosurgical patients with cerebrovascular complaints, revealed an accuraty of 83%, a sensitivity of 89%, and a specificity of 83%. The selection of the patients had no influence on the results as a whole. Compared with contrast-medium angiography, incorrect diagnosis must be expected in 17% of the cases. This includes erroneous negative findings in 10% of the cases. Grounds for misinterpretations are suggested, and the biological and methodological limitations of the method are set forth. 相似文献
315.
The paper investigates 54 myelograms and their influence on diagnostic thinking efficacy, on patient management efficacy, and on ultimate outcome efficacy, using statistical methods. Conventional myelography contributes to diagnostic thinking efficacy having a LLR- value of approximately 0.9. With an accuracy value of 0.95 it can be regarded as a reliable method of diagnosis. It alters diagnostic thinking efficacy in no less than 83% (94%) of the cases and patients management efficacy in 89%. Thus, by definition, myelography may be said to affect the state of health of the myelographed patients in 94.4%. 相似文献
316.
This article attempts to apply a theory of aggression as motivation to overcome obstacles to the understanding of phobic states and their formation. The role of aggression in the genesis of phobic conditions is discussed, and the traditional analytic view of aggression as instinctual drive is contrasted with a motivational approach. The motivational view offers the advantage of a clearer understanding of the stimulus contexts, representational connections, and both real and imaginary object connections that are lacking in the more traditional understanding of aggression as a biological drive. 相似文献
317.
Four of our own cases that presented a clinical picture of dementia are discussed. A study of the relative literature has failed to reveal any "swing" in the pattern of the clinical condition: Just as it did ninety years age, paralytic dementia accounts today for well over 60% of all cases, those clinical pictures erroneously regarded as "typical" "classic", accounting for a mere 10%-15% of cases. The need for routine lues serology is pointed out. 相似文献
318.
319.
This study explored the relationship among love deprivation, Performance greater than Verbal discrepancy, and violent crime in a sample of juvenile probationers. Love deprivation and P greater than V discrepancy was significantly related to violent delinquency after adjusting for the effects of both race and social class, two variables often closely associated with violent delinquency. Also, love deprivation was strongly related to P greater than V discrepancy. We speculated that high performance IQ scores relative to verbal scores are a function of a lack of disruption in the short-term memory mechanisms of high P greater than V subjects, that this nondisruption is a function of hyporeactive autonomic nervous systems, and that this hyporeactivity could itself be a function of early love deprivation. 相似文献
320.
The operant conditioning of response variability: Free-operant versus discrete-response procedures 总被引:2,自引:2,他引:0
下载免费PDF全文

Morris CJ 《Journal of the experimental analysis of behavior》1987,47(3):273-277
The operant conditioning of response variability under free-operant and discrete-response procedures was investigated. Two pigeons received food only if their pattern of four pecks on two response keys differed from the patterns emitted on the two immediately preceding trials. Under the free-operant procedure, the keys remained illuminated and operative throughout each trial. There was little variability in the response patterns that resulted, and the pigeons received fewer than one third of the available reinforcers. Under the discrete-response procedure, a brief timeout period followed each response. Variability increased under this procedure, and the pigeons obtained three fourths of the available reinforcers. Previous successes and failures to produce response variability may have been due to the use or failure to use, respectively, a discrete-response procedure. Respondent effects inherent in the free-operant procedure may encourage the development of response stereotypy and, in turn, prevent the development of response variability. 相似文献